First thing I would check on the rifle is whether the trigger assembly is well cleaned. On my Staghorn the trigger is easy to remove. I then take brake cleaner and spray it clean. After that I have been taking the assembly to the air compressor (after sabotloader mentioned this) and blowing it clean and dry. TheI give it a squirt of Birchwood Casey Sheath. It seems to keep them in tip top shape.

If that does not fix the problem, it sounds like you have a bad trigger and will need to send that back to CVA. My last CVA Stalker had a terrible hard trigger. I sent it in, and it came back with ahair trigger and it suddenly decided it would fire on its own without any help. I sent that back and they finallyfixed it the second time.

As for the difference in loading, all muzzleloaders are not alike. While one will load easy, the next off the same assemblyline can be a bear to load. Just the nature of the beast when there are no set tolerances.