IO one-by-one isn't working for me as well. No occlusions are shown wether old or new cards.

[joaopedromendes]

IO one by one still have the error. No matter how many times I alter it correctly, the clozes go to one side

[AnKingMed]

If you try it in a brand new profile, do you still have the same issue?

Can you share what Anki version you're on?