It might be another form of submissive peeing. Also, never a good idea to yell at them for peeing. This only reinforces it. When they pee in the wrong place, just ignore it, (which is extremely hard) and just clean it up and have a good bottle of anti-pee stuff to spray on it. I know one person who used to clean the floor and while doing so, tell the floor it was a bad floor.
I think the ideas of separating them is a good idea during this type of stress. Dogs do not like nail primping or ear cleaning. :(
Also, I've noticed this in a few of your other posts, but it is not a good idea to compare them to any other dogs you have already had. Otherwise, you'll never see the special things about your new dogs. You will always be looking at their shortcomings. A long time ago, I did that with some dogs and someone pointed out that the new ones were not my previous dogs and that I should appreciate them for their own specialness. I know that Alex and Maxe were very special, but Jimmie and Julie are special in the here and now. Also, you are still learning about their personalities, and they are still learning about your personality.
Faye and her furbabies, Juney (13 yrs old and a sweetie); Trixie (11 yrs old and a sweetie, too); Mr. Gray (8 yrs old); Miss Lilly (8 yrs old)