pretty usual, mine personally has red outlines that's pretty crazy but i think every jardini eventually gets it lol. Mine did have the red circles on the back but when they get older they fade away as my friends but mine have seemed to stay,
https://www.youtube.com/watch?v=A3BgzFLPxw8
the red outline im talking about is right at the end of the video. Its whole body is outlined with it and its pretty crazy haha, the camera isnt very good at picking it up on the body lol.
Every jar i have seen has these different traits but its a shot in the dark as if its going to stick or just fade out. Maybe mine is going to fade later on but looks cool for now haha.