iPhone to Max: certain int messages get zero'd

I'm using OSC_writeAddress() followed by OSC_writeIntArg() to send OSC buffers from iPhone to max, 1 packet at a time. my range of values goes from 0 - 320. this works for integers 0 - 53, 74 - 127, 197 - 309 inclusive but all other values that i try to send arrive at max as 0.000000.

i can't seem to get float args decoded properly at all on the max side and using writeAddressAndTypes doesn't work either.

Does anybody know where these 0's are coming from??

Thanks.