It is a wood plate. Move it. If the screws don’t feel like they are grabbing it isn’t safe. If they grab (all of them) then rock n roll. I work on RVs for a living and this happens a lot. That backer plate is bigger than you realize.
Get a magnet out and figure out where the edge of the backer plate is located. You will feel the difference in resistance when you rub a powerful magnet across the wall where the plate edges are.
I used some spray foam insulation and wood filler to cover up the old holes before mounting again. Worked like a charm.
You should have room on the backing plate. If possible, just move it all up one notch and just make four new holes. Three up top and one new one for the bottom middle.
