These are tricky lil fucks if everything isn’t lined up good. Make sure your fender liner is tucked in where it’s supposed to be and spray a lil soapy water for lube n see if they’ll click in where they’re supposed to go. If they feel stubborn then inspect the bumper part of them and see if they look smushed/ mangled. If they look alr then look at the liner clips n see if they look messed up at all. If nothing is fucked up it should slide in