Stealthburner getting stuck before hitting end stop

I've recently assembled a Voron Trident. When trying to home the printer, the stealthburner appears to be getting stuck before hitting the horizontal (x?) end stop. I can push it manually to the switch, but it feels tight. I don't know if perhaps the belt is loose or if there's something else I should be looking for. Movement seems fine outside of that one spot, so I'm not sure if it's the belt.

Any help appreciated!

Edit: Scratch that. Not the belt. The motor itself is stopping, so there's resistance from something that I can't identify.