Hello everyone, I'm experiencing a strange issue that I have never come across with any glock, my Glock 21 is having problems tearing down (field stripping). After safety checking the firearm, I proceed to pull the trigger in a safe direction, pull the slide back (1/8 of an inch or whatever), and pull down to the slide lock tabs, upon doing so the the slide moves ever so slightly forward but seems to be stuck and only comes off when the trigger is pulled again, this has never been this way, I noticed this yesterday for the first time after I replaced my slide cover plate (which the slide disassembled normally for the last time) , I don't think that has anything to do with it but I have no clue what the issue could be, any insight?