Hello, the truth is that you have to admit that you have a good artistic eye, but this is not enough for AS to accept your images, it has nothing to do with the format, it would be long to explain one by one but in general you can see a blur , noise, overexposure, chromatic aberrations, and lack of dynamic range
watermarks are not permitted
1) messy spots in the black background, oversaturated, not uniformly focused and bright lighting has caused hot spots
2) underexposed except for the blownout sun spot
3) leaning horizon, underexposed shadows
4) extremely noisy and underexposed
5) leaning horizon, some artifacts in the sky, underexposed shadows
6) underexposed, chromatic aberration, and the large blurry area in the foreground is distracting
Several of these that were shot in portrait orientation should have been captured in landscape orientation. If you're shooting with a mobile phone, flip it sideways from time to time...
No, it isn't because you uploaded in JPG; JPG and JPEG are exactly the same thing. Another meaning of "technical issues" is that your photo is not world-class commercial photography, which is the only thing Adobe will take. Please read there guidelines carefully, in detail, and if there's anything you don't understand in the guidelines, you may need to do more study (but we might be able to help with terminology).
If you want us to give you useful commentary
(1) don't upload more than 3 pictures at a time.
(2) be sure it is the exact original file you uploaded - do not add watermarks, reduce the file size, or change it in any way, as this might either add faults, or hide faults.