I have seen twice that my newly found 8-chains share not showing in "share value" display on the upper right of the ypool's page. Both times the display responded to 6-chains and 7-chains like clockwork. So it was not a problem with network or pool's down time. The XPM column in the personal stat page didn't have any change more than 0.001 after the above 8-chains were found.  Not all 8-chains are missing. Often they do get counted.  (Because my 8-chain/h is less than 1, most times it is the 6-chain/7-chains that contribute to the XPM column. So once an 8-chain is found you can see the result in  the XPM column, if it gets counted.)

I am wondering what was happening. I am using one of the unofficial miners. Is it possible that the miner is secretly sending some of the more valuabe shares to another account?