Its wrong information, i can tell this because i have the same problem in my pool. Nomp is a little bit buggy with orphan blocks, sometimes orphant block counts as pending... and then pool tries to payout missing money)))
C-bit on low diff spam blocks as hell and it makes pool go crazy, thats why there is so much pending blocks.

And with so much pending invalid transactions doemon kill wallet rpc and its cant clear pending blocks without help from, admin.