When a rectangle starts widening or narrowing, first decide whether the number of stitches is changing or the size of those stitches is changing. Those are different problems. A border may disguise the outline temporarily, but it does not explain what happened.
Compare the count with the pattern
For a section intended to have a constant stitch count, count the current row and compare it with the required total. If accessible, check an earlier row that looked correct. Follow the pattern's rule about whether the turning chain counts; including it sometimes and excluding it other times creates misleading totals.
Suppose the intended total is 30 working stitches, but your notes show 30, 31, 32 and 33 on successive rows. That trend points to added stitches, not merely a looser grip. Identify the first row whose count changed before deciding how far to undo.
Inspect the first and last working positions
Use the original instructions to identify where each row begins and ends. If a turning chain counts as a stitch, its treatment at the next row edge differs from a chain used only to reach height. Do not apply a universal rule to every stitch pattern.
Place removable markers in the first and last stitches that the pattern counts. Move them as you complete each row. This provides two visible boundaries to check before you work into an unexpected gap or overlook the final stitch. Confirm the total again after moving the markers.
If the count is stable, compare the gauge
Thirty stitches at two stitches per centimetre make 15 cm. The same thirty stitches at 1.8 per centimetre make about 16.7 cm. A rectangle can therefore grow wider even with a perfectly constant count. These are illustrative measurements; measure central areas of your own fabric without stretching them.
Check whether you changed hook, yarn, working posture or how tightly you form the loops. Keep one variable fixed while investigating another. If the foundation is much tighter than the body, compare it with the pattern's setup guidance on a small sample instead of immediately changing the hook throughout the full project.
Choose a correction that matches the cause
| Observation | Next useful check |
|---|---|
| Count changes each row | First/last working positions and repeat boundaries |
| Count is steady, width changes | Measured gauge in comparable areas |
| Only the start edge pulls in | Foundation instructions and starting tension |
| Shape changes after care | Before-and-after sample measurements |
These observations suggest a place to investigate, not a diagnosis for every stitch pattern. Intentional shaping and textured edges may be part of the design. Check the expected shape before correcting something that is meant to happen.
If you decide to undo work, record the last verified row and the required stitch count first. Restart from a place you can identify confidently, then check the next two rows before continuing. The pattern-reading guide explains how repeats consume and create stitches, while the gauge guide covers measuring a consistent window.