TLDR: GAS DISTRIBUTION ISSUE/MATTER DUPLICATION?
I am getting this issues as well, my previous bases are getting many gases crushed to INSANE pressures from 3.5 kg to 8.5, primarily oxygen and dioxide.
I tried making room for those gases but the gases did not dissipate and the INSANE pressures continued(dupes could not have generated as much dioxide in 2 cycles)
I'm not sure if the "matter duplication bug was the issue"(i had no geysers), I'll see if this happens again with a new colony as my other colony is fairly lost.
PS:I've got not high pressure vents at all.