Adding long works creates displayproblems while writing

When I’m in the ‘edit course’ window to add new words in my course and i want to add long words on the left or right side since a few days it doesn’t show anymore what i’m writing after the word or sentence’s length reaches the length of the display field. so if i write for example ‘test test test test test test test test test’ it fills the field almost exactly, but if i add for example the 10th test the whole field gets empty and i can’t see anymore what i’m writing while i’m typing. After waiting a few seconds i can see the text again, until i press another button. This isn’t that big of a problem, but it is just annoying and of course a bug.

So somehow since a few days there is a problem with the infield left-right ‘scrolling’ of long words/sentences/expressions.