How to prevent input from jumping to the top?

[ivnsch]

When opening the dropdown, my input jumps a little to the top so it's not vertically centered anymore and it stays there, also after closing the dropdown.

How do I disable this? The dropdown has enough space at the bottom, there's no need for the input to move. I've been inspecting the css but wasn't able to find quickly was causes this.

[ivnsch]

Adding that the problem might relate to grid-area: 1/1/2/3 attribute of singleValue. If I just uncheck it in the inspector tools and check it again (not changing anything) then it's fixed and further openings of the select box don't shift it (until I refresh the page and open it again).