Quick fix: Tink back to where the mix-up happened. In brioche, you can spot the error because the stitch column will suddenly break the alternating ridge pattern — a raised bump where the fabric should be flat, or vice versa.
What you are seeing
Your brioche fabric has a section where the raised ridge pattern is broken — instead of smooth alternating columns, one stitch looks flat where it should be raised, or raised where it should be flat. A brk/brp mix-up on one row shows up as a reversed stitch in the column above it.
Why it happens
- Working a brk (knit the stitch together with its yarn over) when a sl1yo (slip the stitch, add a yarn over) was needed, or vice versa
- Losing track of which stitch in the pair you're on
- Pattern confusion between brk1 and brp1 abbreviations
Fix it now
- Identify the broken column: look for the ridge pattern interruption. The error is in the row below where the column breaks.
- Tink back to the error row: unknit stitch by stitch, treating each brioche stitch + yarn over as a single pair. See How to fix a mistake in brioche knitting for the tinking method.
- If you worked a brk when it should be sl1yo: place the stitch back on the left needle, slip it purlwise, and wrap the yarn over the needle. If you worked sl1yo when it should be brk: knit the stitch together with the yarn over.
- Continue the row correctly from that point.
Prevent it next time
- Visual check: the stitch you're about to brk should have a visible yarn over sitting on top of it; the stitch you're about to slip (sl1yo) should be bare
- Mark brk rows and brp rows with different color markers at the start of each row