Issue: Forum Theme Change

I have the forum theme Altomare light. One day I decided that I wanted it changed, so I went to my preferences and clicked on the name of the one I wanted to change it to, and the page was reloaded with the theme changed. However, the next day I logged in and the theme was back to Altomare light. So I tried again. And again. AND AGAIN D:< All without any result.

I anyone else having this problem? And is there any way to fix it? I'm seriously getting tired of this theme. Really tired. -____-