Tapestry crochet combines counting, tension and multiple-yarn management, so many problems look different while sharing related causes. A narrowing piece may come from tight carried yarn or lost stitches; an unwanted color can be show-through or a color change performed too late.
The fastest way to fix problems is to identify what is actually changing: stitch count, physical measurement, yarn position, fabric density or chart direction. Before frogging, measure the fabric, count stitches and inspect both faces; those three checks eliminate many possible causes.
The fabric puckers or becomes narrower
The most common cause is carried yarn that is shorter than the row, acting like an internal cord.
Spread the fabric every few stitches and give the inactive strand enough length.
If several yarns are carried at once, reduce the number because excess internal material can also compress the fabric.
Count stitches to rule out units being lost at the edges.
Compare a plain section and a multi-color section with equal stitch counts. If only physical width changes, tension or bulk is the main issue.
Do not make the next row extremely loose in an attempt to repair a narrow section; correct the habit where it begins.
Mark the expected width on a table or measure every several rows so compression is noticed early.
Carried yarn shows through the visible stitches
A dark strand inside pale stitches can appear even with correct technique, especially in open fabric.
Keep the carried yarn slightly toward the reverse and maintain even stitch tension.
Test a slightly smaller hook when openings are large, but avoid turning the fabric rigid.
If the color does not return soon, cut it or use a bobbin rather than carrying it across a long pale area.
Reduce internal strand count too: hiding three colors spreads the visible stitches and exposes more yarn.
If the problem occurs only at color boundaries, check the timing of the change before altering gauge.
Swatch the highest-contrast color combination. If only that pair shows through, palette contrast may be the main factor rather than a general technique problem.
Color changes create bars or messy boundaries
The next color should enter during the final pull-through of the previous stitch, not after that stitch is complete.
Changing too late leaves the top of the stitch in the old shade and creates a visible bar.
Avoid pulling both yarns hard after the transition because that can distort the boundary and tighten the fabric.
At edges and corners, prepare the new color before turning so the first stitch begins with the correct loop.
On joined rounds, mark the round beginning so the join is not accidentally treated as another stitch.
Practice the same change repeatedly on a swatch until the motion becomes consistent.
When one transition alone looks loose, redistribute tension through neighboring stitches instead of yanking the tail.
The motif shifts, slants or no longer matches the chart
First verify stitch count. Losing one stitch shifts every later color transition.
Then check reading direction: flat rows usually alternate after turning, while round work commonly continues in one direction.
A smooth, consistent lean can come from natural stitch geometry rather than a mistake.
Use vertical chart landmarks and observe whether the shift happens suddenly or gradually.
In spiral construction, the round beginning also moves around the piece and can make the motif appear to rotate.
Do not compensate by adding random stitches; determine whether the cause is counting, construction or structural slant.
Take a straight-on photo every ten rows to distinguish gradual drift from a sudden chart-reading mistake.
Edges become uneven or the piece changes width
Mark the first and last stitch of every row until edge recognition becomes automatic.
Check whether the turning chain counts as a stitch according to the pattern; duplicating or skipping it changes width.
Measure every several rows and recount if the piece begins becoming trapezoidal.
Carried yarn can also pull one edge more strongly when a color stops directly at the corner.
Distribute woven ends so one side does not accumulate more bulk than the other.
Blocking can smooth small waves, but it cannot repair missing stitches or a major tension difference.
If only one side is growing, inspect the first and last stitch specifically on rows worked from that direction.
The fabric becomes too thick, rigid or difficult to crochet
Too many carried strands inside every stitch are the most common reason.
Use regional bobbins, park colors and cut yarn when a shade will not return for many stitches.
Check hook size as well because an overly small hook compresses the fabric further.
If hook insertion is difficult and your hands tire quickly, the density is probably not sustainable.
Swatch the most complicated section of the pattern rather than testing only a simple two-color area.
When troubleshooting, change one variable at a time: tension, hook, strand count or carrying method. That makes it clear which correction actually works.
Record the result of each test so you do not accidentally return to a setup that already made stiffness or show-through worse.
Most tapestry crochet mistakes become manageable once counting, tension and yarn management are separated. Measuring, inspecting both faces and using small diagnostic swatches lets you correct the real cause before repeating it across many rows.