I still havent figured out what it is yet, but almost all 32degrees models (rebel, btb, extreme, etc.) have this problem. What I think it is is that the gun just has to be broken in. I had the same problem with an old 32 degrees Rebel 02, and it took about 30 minutes for it to work right. All I did was take out all the parts, lube them, reassemble them, and keep firing. Eventually it just started working. Just keep at it - taking out the parts and putting them back in and it should break in. If youre still having problems, PM me.
P.S. Next time, get used to a marker and the way it operates before you upgrade it to the max. You may later realize that you just should have taken it easy, and maybe gotten a better gun later down the line. Just my 2 cents.