Did you increase the mining difficulty?
I got different number of howls from my computers running at the same time.
It should run the same on every computer as it is measuring your time on the computer. The miner is being overhauled and will look very different when it is released this week. I will check across many devices to see if I can replicate what you said.
It's recommended for anyone who kept the miner open to hit withdraw and close it until it relaunches.