Welcome to iRV2.
Sorry you here with problems .
I took about three looks at the pictures before I realized exactly what I was looking at .
I now realize that the first picture , is a close up of the scratches on the bars in the second picture ; and that by the look of things the table support cone was mounted to the floor using screws that were too long; judging by the 5 wear spots visible in the, first picture taken underneath.
I'm pretty sure that slide adjustment won't fix this.
Can you feel anything by pushing up at the five wear points?
If you can; I'd remove the screws holding the table cone to the floor , and either find screws 3/8" shorter , or if you have a bench grinder , grind them down , and re-install . Use a very fine sand paper and buff the scratches out of the plate , then operate the slide to see if they reappear .