Selection loses focus between projects

I'm currenly working with copying some things from another project so I have the 2 projects open I need. The issue is that if I click on something in the Overview pane or HTML window, not sure it matters where, and switch between the two projects to compare these settings, after anywhere from 1 to a few clicks back and forth they eventually lose focus of whatever I have selected. Very frustrating :(

Mac Version, OS High Sierra (and holding until I can't any longer lol)