ALT key acts like it is stuck in Webflow Designer

As the title says; the ALT key acts like it is stuck. This happens only on Webflow designer. I have to click the ALT key to disable the effect for each action I am doing. Let’s say, when I first hover my mouse over “the size” boxes in the designer (where you enter the size of an element), it shows a horizontal arrow as if I was hitting the ALT key. I need to ALT key to disable it.

I don’t know what causes this. Any idea?