'14 Double cab map lights stuck on dim

Seem to have run in to a weird issue with my map lights. The missus and I went to a movie and when we went to leave, I noticed both the driver and passenger map lights were on, but not at 100% brightness. I had swapped them out for LED's and have never had an issue before this.

If I turn on the drivers side map light, it goes to 100% brightness and then passenger side turns off. Turning the drivers side off again puts them both at 25% brightness. Turning on the passenger side doesn't effect the drivers side.

It's late, so I didn't have time to try and find the cause but I did pull the bulbs for now.

Anyone have any suggestions? I'm not even sure where to start..

Edit:

Seem to have solved the issue. Looks like one of the T10 LED bulbs I had put in was faulty. I switched back to the halogens and there's no 'dim' light anymore. Also when I had swapped the drivers side LED for a halogen, the passenger side LED wasn't dim anymore.

This is what it looked like for anyone interested:
Both map lights on dim:


And here's what it looked like when the drivers side was turned on: