Formatting gone-can't save changes

I have a page to which I add pictures on occasion, which is what I did today. When I hit “update,” and then viewed the page, the formatting was all messed up.

I tried fixing and updating a dozen times, but each time, my changes are not saved.

I should also mention that when I signed onto my site today, there were “error messages” about not being able to change the header, etc. There was a “click here to correct” button, which I clicked. I then got a message that the errors were “fixed.”

Thanks in advance!

Susan