Yeah, there are no keys bound to control. The only thing that's not removable seems to be a part of journeymap's stuff that uses control key for something... I'm going to look into it further. Part that really bugs me is that it keeps doing this even after complete removal and re-installing of the instance. Will try using the ftb one rather than the curse launcher one to see if that helps.
Edit 1: The FTB launcher version seems to be running fine with the control key. Now to double check the curse launcher version.
Edit 2: Curse launcher fails on control press. Going to update the modpack to run on latest version of forge, and then update journeymap. Hopefully this works!
Edit 3: Success!!! Somehow the Curse Launcher was using an older version of forge and journeymap. Updating both of those fixed the issue!
Specifics: Curse Launcher version of Post Finem was running on Forge-10.13.4.1448, with Journeymap version 5.1.0 Unlimited. Telling the profile to run Forge-10.13.4.1614 and using the most up to date version of Journeymap fixed the issue