@doubleome Tank barrels have been broken one way or another since launch.
Changing from 3rd to 1st person does nothing to fix it for you?
I have issue when barrel gets stuck in certain position while in 3rd person(usually pointing to the sky), then I have to change to first person to get it "unstuck".
It happens when I get close to an object and barrel corrects itself over the object, but then it stays like that. It's not a rare bug either, it happens every match multiple times in a round.
There's also that old bug when the center of the screen "decouples" from the crosshair in first person and then I also have to get out of the tank and reenter to fix it. Not sure if this is the same thing you're talking about since there is some movement (albeit limited), but you state it's 100% stuck.
