"Technical issues" for rejected photos that seem fine

I'm pretty new to this platform, so I was really confused when I saw that two of my photos, which I thought were fine, were rejected on account of "technical issues". Since there was no other information given to me, I hoenstly do not know why these photos were not accepted. I'll admit, they aren't my best, but I don't see any glaring issues like over/underexposure, motion blur, out of focus, excessive grain or really anything else that's mentioned on the review process page. Can someone please explain why they think these got rejected? I asked some friends and they thought they were fine, so I'm just wondering what you all think.