Ramp on semi-trailer doesn't want to come back up

After loading vehicles on the semi-trailer ramp, I cannot get the ramp to come back up. It looks like it wants to come back up but then drops back down. Tried numerous times. When I drive the ramp just flops up and down. Anyone else had this problem?

i had this on a previous version of the game it hapen i think when i tried to load up a heavy vehicul and the trailer partialy glitched into the ground the two leg under the ramp.

Nah, it happens when it's empty too. Makes it impossible to reverse.