Monk Question

[Raumoheru]

i just got my new pc put together and installed PoR on it cuz i havnt played it for a while and wanted to play again

i almost always play a monk.

in PoR you have to multiclass cuz the max limit for a single class is 16 but the max limit for a single character is 32.

i always go monk to 16, then fighter to 16.

but for some reason no matter what i do i am not getting the Base Attack Bonus for it.

i.e for my Melee the first bonus at level 16 is +22, but after adding 16 levels of fighter it is still only +22.

i like to use Black Adder to goof around with my chars and add 16 fighter and ranger levels after i get to 32, and it brings the BaB to 70 or so with my fighter rogue.

why is this not working for the monk??!!!