Issues with PHP, PDO and pgpool

I have two computers with two Postgre databases. I am using PHP with PDO and working with pgpool.

Often times I receive this error

ERROR: pgpool detected difference of the number of inserted, updated or deleted tuples.

Or I get an error saying that the connection is out. Everythi开发者_运维百科ng works fine without pgpool.

Is this is a known problem?

Problem was in different sequences of table