its nothing wrong. Some GSDs carry their tails like that so they dont touch the ground when they walk. A lot of the time its just natural for them. Nothing to worry about. The tail angle in the 7 months picture can be attributed to anxiety, trying to make himself look bigger, sometimes it can be taken as an invite to play, sometimes it can be dominance. Really not a huge thing to worry about.
The 7 months picture with his tail curled like that and his head angled over the back of the other dog, i would stop that behavior as its a sign of dominance.
Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus BCAT CAX2 CGCA ETD HCT NCO-1 PKD-T RATI RATN RA TC TKA 3/18/2013
"Hades" Guilty vom Blutfeuer 10/26/2018
Zena GSD 6/1/03-2/16/2016
Riley GSD/BC 1/10/05-2/1/2013