I checked for caching. I turned off caching on both the Joomla installation and on the hosting level quite a while ago. I didn't install any JS compression, and nothing pops out in quick scan of my plugin list (in case something else I installed added it). The "System - Page Cache" plugin is disabled (don't know if that is the same one as the system settings).
I'm using the Protostar template (with CSS modifications). As far as I can tell, it doesn't appear to be using JS compression. When I check resources in the browser console I see 20 different .js files loading (mostly CB and boostrap related), but nothing jumps out as related to compression, though it could be implemented within one of the other .js files. Is there something specific I should be looking for in those files that would indicate compression is taking place?