The miners for lyra2v2 have a problem with low hashrate reported by the pool - the miner overreports the actual hashrate.
Try tpruvot's 2.2.5, try djm34's version. Add --submit-stale as a command line parameter.
This is the response from ahashpool support:
"Use ccminer nanashi
It is a known issue for other versions of ccminer that they don't submit lyra2v2 shares properly"