mpc sounds missing

often at times i find that when i export samples in 16 bit, 44.1 the mpc misses some of them, why does this happen, like i converted samples to 16 bit in my daw and in the mpc alot are missing and alot are the same sample. its so frustrating. i dont wanna sample in the mpc thousands of kicks and snares.
im on the latest free jjos. but i noticed it happends on the orignal akai os

make sure your filenames are 16 characters or less ( not including the file extension such as .wav or .aiff ).