Crossbow Shot 1 and 2 randomly load wrong ammo

I have frag rounds ONLY on xbow shot 1 and other 3 ammunitions on xbow shot 2 wich i cycle for mapping/bossing, skills are properly assigned.

It happens sometimes probably due to fast switching ammo that skill assigned on xbow shot 2 are loaded into xbow shot 1, where i have only 1 ammo permanently loaded.