Quick fix: Spread the stitches on your right needle before carrying the float across — this gives the float enough length to match your stitch tension without pulling.
What you are seeing
Your finished colorwork fabric puckers or pulls on the right side, and when you flip it over you can see long, floppy strands of yarn hanging loosely across the back. Those strands are floats — the yarn being carried behind the stitches where you're not working it. When they're too long or too slack, the fabric distorts.
Why it happens
- Not spreading stitches before carrying the float, so the float ends up shorter than the row width
- Knitting too tightly overall, causing the floats to pull the stitches inward
- Carrying floats over more than 5 stitches without catching them
- Switching to stranded knitting from flat knitting without adjusting needle size
Fix it now
- If the project is unfinished: from this point on, spread your right-hand stitches apart before each float so the carried yarn has enough slack.
- For a completed piece with consistently loose floats: wet block aggressively. Pin the fabric to its correct dimensions and let it dry fully — this often tightens up the fabric and makes floats less visible.
- For a single very loose float: thread a tapestry needle with matching yarn and weave it through the float and adjacent stitches to pull it snug, then weave in the end on the wrong side.
- If the overall fabric is too loose and blockin won't fix it: frog back to before the problem and re-knit, sizing down one needle size for the colorwork sections.
Prevent it next time
- Spread 4–5 stitches on your right needle before every float carry
- Catch floats longer than 5 stitches by twisting the carried yarn around the working yarn once
- For stranded knitting, go up one needle size from your regular gauge needle — colorwork typically knits tighter than stockinette
- Knit in the round where possible — it's much easier to manage float tension than working flat