How to fix a kickstand that slide?
Your frame came kickstand ready. The bracket and hole are part of the frame. On your installation it appears they installed the top plate for a frame that is not kickstand ready. Not only did they use the unneeded plate but it is in the wrong place. I would remove the kickstand remove the rectangular silver colored plate. The kickstand should line up with the bracket on the frame. Tighten the allen head screw and you should be fine. If need be a drop of thread locker on the screw will keep it from loosening.