They do appear a little 'skanky' too me also, give them a thorough rinse and wash. Using only a very mild soap (if you do use soap)and be very gentle when doing so: F.M.J. is an harsh 'mistress'.Your last picture with the circle looks like the top tab isn’t seated all the way in the channel. I can actually see the tab in between the gap. I would remove the arm and check if there’s debris in the channel and try to reinsert