Hello wild.
Please could you specify which military tents do you have in mind? The ingame item or some object? If its object please specify where the object can be found (for example through http://dayzdb.com/map/chernarusplus).
Regards,
Geez

Hello Geez,

More precisely, the military tent I mentioned is in the N-O airfield (big one), more or less in front of the fort_watchtower. The ground of the tent is in wood.

Next time I go there I can report It more precisely but otherwise you can find It easily.

Hello wild.
The issue has been confirmed and scheduled for a fix.
Regards,
Geez

OK thanks Geez.

As a side note today I experimented the same issue with the small wood cabin in front of the big boat along with the see (the big boat near Elektro). Sometimes I pass sometimes no and I have to crouch me. It looks like It's a question of a few space too short.

Thank you.
I will look into that too.
Regards,
Geez

One more tent in the NO military airfield is too low:

when you are front of the the 2 medic tents with red cross the 1 green military tent at the left side.

I'm blocked when running in and out.

Hello wild.
The issue has been fixed internally and should be fixed on Steam soon.
Regards,
Geez