Canon 70d. I don't know if the mirror is moldy or something. The problem is not big. Ask the great god for help

Just looking at the photos, you can't see why. ...

Let's test it from the experience ... when using the optical viewfinder, if the effect is satisfactory, it is definitely nothing. There is nothing wrong with the photos taken, so there is nothing else.

Because, if the camera is really moldy, it is a mess whether it is taken or not!