Yea, too many laps on the Chrome Oxide, or too much pressure.

Take a Q Tip and lightly drag the cotton along the edge. Any micro-chips will snag.

If your 12K is a Super Stone, it will be all you need to straighten the edge out. Lightly drag the edge on the corner of the stone, lightly.
Then do 10-20 X laps and you should be good to go.

Do not finish with slurry, try plain water, If your 12K is not a Super Stone you most probably will need, way more laps. A lot depends on the face prep of the stone. Chinese stones are not 12K, some are better than others, but I doubt any are 12K, maybe 6-8k tops.

Look at the edge straight down, if you don’t see shinny spots, you’re good. Now do 5-6 light laps on the Chrome Oxide, then clean and do 50 on leather.

If you still have a problem, look at your Chrome Ox strop, it may be contaminated.