That one is just 50Mh/s as Im testing to see if I get everything up and running before switching the whole rig (I know is just a few minutes but dont want to waste even a second hehe), so what do you mean that the shares submitted by cgminers are not the same as shares accepted by p2pool? shouldn't I receive a rejected message or see something on p2pool?
Sounds a little like you may want to read
https://en.bitcoin.it/wiki/P2Pool