X axis pulleys rubbing on rail

Hey everyone, I bought this x carve 1000mm machine used and it has been working well for me after some adjustments. I am noticing now that the pulleys on the x axis are rubbing/rolling on the rail. This is unlike the y axis where the pulleys are suspended above the rail. the x axis isn’t moving as free as I think it should. I didn’t set up the x carriage originally but why would this happen? I watched the video from investables on setting up the x carriage and it doesn’t seem like there is adjustment for those pulleys to move up and down.

PS I’m new to the CNC world. Thanks in Advance

I think is normal, a bit more tension on the belt will pull them away slightly