Before someone thinks I or some other creator is a cheater or using bots.
A few days ago I noticed images showing up again in the daily gallery even though they were uploaded days before. When it happened with one of my own images I reported it. Since I am an IT developer I got curious and checked the civitai GitHub. We tested it and our guess was confirmed, my two last images at that moment reset datetime and appeared in the daily top again.
You can compare the datetime of posts and images to make sure.
My images with a bug:
https://civitai.com/images/97075879
https://civitai.com/images/97075923
Others examples:
https://civitai.com/images/96964194
https://civitai.com/images/96405944
...
I added all detailed info in my report.