@willbprog127 I created a new Geany binary with an updated theme that is based on
https://github.com/vinceliuice/WhiteSur-gtk-theme
The installer is here if you want to give it a try
https://download.geany.org/snapshots/geany-1.38_test_osx.dmg
Not sure if it fixes the problem for you or not. I actually never saw the problem you described but have seen this behavior e.g. on combo-boxes in Geany settings where you have to keep the mouse pressed while selecting from the popup menu, otherwise the first item gets selected. Unfortunately, this happens with the new theme too.
This most probably is a problem in the macOS GTK version which isn't 100% mirroring the linux behavior. Maybe one could also modify the theme somehow to avoid this, I'm just afraid I don't know GTK theming enough to do this myself.