A valid point. It seems the rotten in this case might be using arrow keys (if present) to move the caret out of the word. If I peck with a finger (arrow keys or not), everything works as I suppose it should. I can go into the word with arrows, but after correcting I have to peck out to continue writing without any weirdness i.e. moved letters.

Absolutely. There was that one project last year, but nothing's been heard in ages.