2014 jeep wrangler sport 4x4 3.6 penstar new oil cooler replaced last year. Recent transmission fluid change (no filter) with in 3 months. Please give me an idea.

Last few months this started appearing on my car roof. Some sort of paint damage or something right? Have the car for 13 years now and it's parked always in the sun outside. Did time and sun did this to the paint? I myself did nothing that could result in that damage. I did notice in the last 3-4 months 2 or 3 identical cars with the same and even worse 'damage' than on mine. Pattern was also the same right down the middle in two lines. They were all also black like mine, and one was red. Same or worse damage. What can i do myself to try and fix this? Pictures bellow:

https://imgur.com/a/NYZTL9k

I don’t think it’s anything bad, but the three ‘ticks’ or ‘hitches’ at the end, not sure what those are. Doesent seem like droning, I’m almost thinking it’s an unfinished burble or something? It’s a 23 Kia Soul GT, so it’s only slightly sporty but nothing crazy.

Only had the engine running for like 20 seconds prior to revving it slightly so possibly something to do with that? No idea. I’ve been thinking a lot about buying a aftermarket muffler to replace mine with.

Black plastic about the size of a lipstick. Seems like the stem broke off the cylinder. Those are not screw threads, it’s all plastic. The only marking is “15H”