My main blog is possessed!

Hey, fellow bloggers!  Has anyone else had problems with their wordpress blog?  My main blog in ona Wordpress.org platform, and I keep on having mysterious things happen to the formatting.  For example, when i insert a photo, and align it on the right, and press save, all of a sudden, the photo jumps to a totally different location and all the text below the photo gets changed to the font style used for my subheaders (larger, bold, and green!).  Then, to make matters worse, I cannot change it back!  It is as if my blog is possessed!  I need an exorcist!