When i set a variable all other variables reset

Yeah, that definitely shouldn't be an issue, your code looks fine. Try regenerating the code and clearing the gradle caches- it might also be worth testing this in a separate workspace to see if the problem persists.

To regenerate the code, press the orange button in the top right hand corner. (The mouseover text tells you which one.) Reloading the gradle caches is a more extreme measure that takes quite a bit longer, but fixes errors that have to do with stuff getting corrupted. To do that, you need to go into the 'build' tab at the top of the screen, and select 'build and run.' It's a good first thing to try if you're getting a weird error.