@IMustDoMoreExercise Quite a few of us regularly experience difficulties typing into the grid.
In my case it's usually what I describe as 'sticky keys' where it doesn't register the letters I type. This is especially bad with words that have double letters, but also happens in other words. This then causes typos that I have to go back and correct. This happens in both the CW and PW grids.
There are also occasions where it randomly switches from entering across to going down, and vice versa.
It's all very frustrating in a timed puzzle! I don't have any of these issues in puzzles on other sites.