Vanilla map linedef bug/problem

[Paul977]

Basically I've made a line W1 Floor lower to 8 above highest floor which affect 2 sectors on the left and 2 sectors on right of the player. When I walk on such line the 2 sectors on the left lower while nothing happens for the 2 sectors on the right except for the neverending sound of the floor lowering.
I tryed to change the actions but the same problem happens: I heard the sound but the floors don't move.
This happen with prboom+ comp. level 2 if I change comp level to default the issue doesn't occur but I don't want to change compatibility level.
Someone know how to solve this issue ?
Regards

[scifista42]

The sector that doesn't move is probably blocked by a thing. If you don't see any thing inside the sector itself, see here.

[Paul977]

You are right moved two things a bit back and now works, thanks scifista