1st picture says it all in about .4 seconds
Notice that dragy scrapy "key on the paint" look down the side of the shell, and that shiny little ding right above the rim?
BURR or left over bullet coating that's stuck in the chamber...time to rub a dub dub scrub it clean (ever heard of sticky bolt syndrome on the Russian Man cannon...well same thing..but on an AR that FORCEABLY snatches the round out with gas pressure... what do you expect to give...the extractor, or that soft maleable metal of the cartridge
Your AR is doing what it is supposed to be doing...YOU ain't! Clean the chamber shiny smooth!
Believe it or not...a teeny bit of gun oil on the fingers when you load your mags also helps [kinda like resizing oil], keeps em slicky smooth