I can't reproduce this issue.
(Sorry).
This is just a textbox like the others. Unlike say the accuracies, it's a fairly simple single control and nothing overlaying anything else.
I can't work out what's going on.
Tooltips only appear when you're not moving the mouse and then only for a fairly short period of time.
The idea being that they should not be too intrusive.
Once you've seen a tooltip the first time you probably aren't interested again.
For what it's worth....
I tested on both my win 10 machine and my ( junk ) win 7.
I can see the tooltip appear when the cursor is anywhere over the textbox.
I took a picture with my mobile:
