Combo box editing bug

I may have found a bug with the combo box-pulldown feature. I've attached a screenshot demonstrating the problem.

I'm using the desktop version.

I dragged the combo box into the main section of the screen, kept the first row empty and wanted to have my personalized text in the second row of the combo box. I changed my mind and brought my personalized text back into the first row (with a space before the text). At this point I saw that the text from the combo box was well above the actual combo box - you can see this on the right side of the screen.

I can't seem to replicate the bug again though.