If you smash Enter + other letters sometimes the cursor (apparently) moves to the next line but does no go back to the first column (as expected). I tried to reproduce it artificially dispatching events but it did not replicate. In the codemirror.net example looks like this:
Tested and getting the same bug on {Firefox|Chrome}/macOs14.5; Chrome/Win11
Safari@mac14.5 is not affected. I can provide more details/versions if it may be helpful.
Sorry for the messy reproduction I hope it is easy to fix and not a weird browser behaviour.