Low number of valid shares on hiveos on hiveonpool

I have weird problem with my miners. I have 2 miners working on hiveos (miner-1 and miner-2) and 4 working on windows (rest of them). If you look at picture below you can see that hiveos miners earn almost the same amount of valid shares as windows miners, but hiveos miners have almost 3 time more hashrate than the windows one’s.

It’s only take place on hiveon pool. On sparkpool these miners work as they should. So it looks like windows is 2 times faster on hiveonpool than hiveos ;(
Any thoughts why?

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