Theme and website messed up.

I log onto my site today, and my theme has been changed to a previous theme without me changing it. Know one els has administrator access but me. I goto restore my theme from a few days ago, and check to see if it change back, now its just a messed up theme that is combined with 2-3 previous themes that Ive used. It even happens when i goto add a new skin, it just combined pretty much all the themes Ive used into one frankenstien theme. Restore doesn't work, new themes wont work, deleting the CSS wont work, literally nothing works, i can really use help if anyone know's what is going on.

Can we have a link to your site?

Take a look https://help.forumotion.com/t13102-my-themes-are-changing-by-themselves

The last post fixed it for the most part, i hit ctrl f5 as i used a theme off of hit skin, and it worked until i tried to re-add my images. and it went back to being messed up. But i did it as i restored my original theme from a few days ago and it work. Hopefully it fixed it for good but i don't want to take a chance on editing anything. Any pointers to try and keep it from happening again? or should i just keep hitting ctrl+f5 every time i change something.

You probably changed it to many times in a short period. Evoid doing that and it wouldn't supose to happen again.
You should have deleted your CSS, installed a basic CSS(theme) for your verison, and than install a hitskin theme, and leave it for a day with doing NO changes to it.
Do that if it happens again and everything should be O.K.