yes this is normal on p2pools.
if you are mining with a low hashrate you could request lower difficulty work from the node. you do that by appending +0.000x000 to your username
ie: EKk4ZuTM7t8xtnGNPUkSozJh7XGdKPfg3B+0.00012000 would result in workitems with difficulty 8. the lower the number, the lower the diff of workitems sent to you.

however this does not affect your payouts at all. you will still only be credited for work solved that actually matches the real difficulty of the p2pool network.
it is more a cosmetically change (your miner's screen output looks better and it is more easy to see if your miner is working correctly)