UI3: Variant Properties Popup box bug

Hi.

There’s a bug in the new UI3 variant properties popup box bug, at first it works normal:

and then suddenly it’s like this:

I can’t even accurately drag the variant I’m changing position.

if you wanna do this, at least have the entire thing draggable and as long as i click hold it instead of trying to click the tiny icon on the left. I’ve tried dragging the entire thing but the function is to modifying the value only just like it’s click function.