Skylab question

Ive read that the production time of promerium is 2081 per hour on the max lvl of skylab.
The problem is that I have skylab fully upgraded to lvl 20 and for the last 24h it only produced like 4 thousands of promerium. Also it wasnt producing serpom at this time because i have it full 9079 out of 9079.

Can someone explain this to me please?

you have to turn off the seprom module otherwise it will make seprom even it the storage is full and "trash" it.

Disable your seprom production.