Deco time wrong

[Dimitri]

Hello everyone,
I'd like to understand why when the computer reaches the decompression stops, it doesn't follow the indicated minutes but also significantly extends these times. For example, from 10 minutes at 6 meters, but in the end, almost 18/20 minutes pass.
I tried staying slightly below 6 meters (the meters number appear in green), I tried staying exactly at 6 by blocking it on a support, I tried staying slightly above (5), but in the end, it doesn't change.
Resetting its timer, I noticed that each minute actually passes at about 1:45/2 minutes.
If anyone knows the reason, thank you in advance.
PS: The setting is on full Bhulman without gradient factor (110/90) and computer is Ostc 2 tech

[jb2cool]

Why gases do you have set? It’s possible that you have gases set up that you are not using and the computer was expecting you to use them