Storyline 360 Triggers not displaying properly

There could be multiple causes here, but you have indicated that you are "...working locally [and] on the network." You can share and interchange SL files easily across any network configuration (Teams, OneDrive, GDrive, etc.); but you cannot work on SL files effectively unless you are working with the files locally. So in your C:\Documents\My Articulate Projects location.

Our team regularly exchanges files over OneDrive but we do not attempt to work on them outside of the C:\ drive location. 

So you may be creating problems with trying to work from a different file location.

You may also have conflicts that arise from other programs (competing for limited memory resources); multiple displays (similar to the well-documented problems with the graphic color picker issue); or even problems potentially caused by your network and/or VPN configuration. But based on your own statement, I think you will see that working only on files in the C:\ drive location will not have the behavior you describe.