Textboxes - strange phenomenon

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I have a strange phenomenon.
In text boxes with several lines, it sometimes happens that characters entered are swallowed.
But not in all, so I can't create example code for it.
But what I was able to determine when in a text box, for example, already
aaaaaaaaaaaaa stands
and I always quickly double-click bb from cursor position 0, then the result is sometimes
bbabbbabaaaaaaaaaaaaa....
instead of
bbbbbbbbaaaaaaaaaaaaa....
So he simply left out the 3rd b here and is still one step further with the cursor.
Therefore the a remains in the middle.

Do you have any idea what this could be?

Thank you.
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I think I’ve now found the problem for omitting input in text boxes myself. A timer with a 500ms interval runs in the program. If I increase the timer to 2000ms it takes all inputs.

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