None of the images have an ICC profile. You should use the original profile (P3) and convert it to sRGB before uploading. If someone opens an untagged picture, the colors can deviate extremely from the original. In addition, details are missing. If you zoom in to 200%, it looks grainy and lumpy.
I would also advise you to edit the pictures with Lightroom - not with Instagram ;-). Lightroom for the iPhone is available free of charge in the App store.
I only looked into 5386. If you look at 100% at your image, you see in the background artefacts, that should not apear:
This happens when overprocessing pictures, probably taken with small sensor cameras.