Updated to 13, Miner only doing work around 5% of the time, idle the rest of the time.

Hello, been mining since version 12 and my miner would run the CPU almost constantly, max cores - 2 threads.
With the update, it seems like almost no CPU usage is being done. I have one master miner as my witness which I'm also pow mining on, then 2 non witness miners.
All use the same miner = information
Am I doing something wrong?
On my remote miners, I get:
no witnesses configured! please add witness names and private keys to configuration