human
fix a floor in a trailer home
gpt
What seems to be the problem?
human
It looks like a section is coming loose
gpt
What’s causing the floor to come loose?
human
looks like a piece of the plywood is coming up beneath the carpet
You need to secure the piece of plywood firmly.  Are there any expansion joints or obstructions underneath that are making it difficult to do so?
Try to pull up on the carpet to see if you can get a grip on the board.  If you can’t pull it up, you might need to replace it.  The floor is probably supported on both sides by a wood frame.  Check to make sure the frame is level, and that it’s not bending or bowing.  Check to make sure you have a good foundation under the trailer.  If anything looks like it’s off, you might need to level the trailer, or replace the foundation.