Goldshell KD box hashrate is bouncing, 15° temp difference

received and started my Goldshell KD box miner today.
So far all seems fine, my status is happy. :grin:
But I am wondering if it is normal that there are 2 different temperatures shown on the dashboard that are 15° different from each other even though the fans are running almost the same speed.
And also, is it normal that there are these drastic down peaks in the hashrate?
Do you Guys have the same situation? Is it reasonable?
Appreciate your feedback.