Combo box bug

When I make a selection in my combo box component the opened selection box closes however the border of the selection box remains visible.

How can I resolve this?

After troubleshooting I noticed that this only happens when I have deselected the “export in first frame” checkbox in the combobox linkage identifier. (had to uncheck this box to set up my preloader)

It would be fantastic if someone could tell me whats going on