Contribution not working properly! Last N Shares!

[ahonder]

System information

Geth version: geth version or commit hash if develop

Redis version: redis-server --version

OS & Version: Linux/OSX

Commit branch and hash: (master, ba60e1c)

Expected behaviour

Actual behaviour

Steps to reproduce the behaviour

Backtrace

[backtrace]

installed ETC Pool, one miner disconnect from my pool,after that pool found a block. But disconnected miner contribution still have. What is the problem? config.json files default.