ComboBox Down Arrow Disappearing

Good Day

Experts:

I have a peculiar situation with a few of my ComboBoxes. When I switch to FIND mode, the odd behavior begins. A vertical line appears to the left of the down arrow essentially making the last part of the ComboBox a square around the arrow. Then after I make a selection from the list, the arrow disappears! If I click where the arrow should be I still get the list of items in the box.

This is not happening on some of my other screens. I cannot find any differeces.

Has anyone ever experienced this? If so, what do I have wrong?

Thanks,

EJD