If you check my first post, I said it's happening with all themes, as I have tried several. I even posted a screenshot.
However, right now I am trying to change themes and there are some that render images but the vast majority doesn't.
1 random example (I would put more but the platform is limiting me to 1 image because I am a new user):
So I will try to use one of the themes that do work but I still think that something is not quite right here, either most of the themes are not compatible or something else.
In any case, I thank you for your help and time, feel free to close this thread, not really sure if anybody else will find it useful, though as I am not sure which one of the things I did made the difference.