[2018-03-13 16:48:15] : Difficulty changed. Now: 152212.
[2018-03-13 16:48:15] : New block detected.
[2018-03-13 16:49:42] : Fast-connecting to dev pool ...
[2018-03-13 16:49:42] : Dev pool connected. Logging in...[2018-03-13 16:51:44] : Difficulty changed. Now: 99485.
[2018-03-13 16:51:44] : Switching back to user pool.[2018-03-13 16:53:15] : Difficulty changed. Now: 66323.
[2018-03-13 16:53:15] : New block detected.
[2018-03-13 16:53:40] : Result accepted by the pool.
[2018-03-13 16:53:45] : Difficulty changed. Now: 132646.
[2018-03-13 16:53:45] : New block detected.
[2018-03-13 16:55:35] : Result accepted by the pool.
[2018-03-13 16:58:15] : Difficulty changed. Now: 96470.
[2018-03-13 16:58:15] : New block detected.
[2018-03-13 16:58:21] : Result accepted by the pool.
[2018-03-13 16:58:45] : Difficulty changed. Now: 192945.
why did the mining software connect to the dev pool in the middle of the mining?