When you research Power armor MK2 all my weapons start cycling so i can not fight properly . I removed all other mods and it wasn't them, then i force research on a new map each tech i need and once i am on Pa MK2 my weapons cycle.

That is sort of intentional, to allow you to cycle through the rocket launchers (and get the speed bonus). To be honest, it should perhaps be removed, and the speed bonus could just be applied directly to each rocket launcher. The way around it is to just insert 1 type of ammo into your ammo slots at once.

Removed in 1.6.3. I'm planning slightly more of a rework of weapons in the future (flamethrower change and probably reduce number of rocket launchers to 1 or 2).