I had made a gallery to show off artwork I’ve liked and set it to random, but it doesn’t really feel random…

It always shows the same thing only swapping maybe 1 or 2 out and it’s usually only showing art that’s been uploaded a year or months ago, why is that?

Am I doing something wrong? Do I need to add more columns or like more artwork to truly get it to work or is this just how it is rn?

Cuz it sucks that it doesn’t seem to be actually randomizing the gallery :[