My pages changes aren't saving!!

In the last two days, I’ve noticed that my pages changes don’t “stick” when I click the UPDATE button. The Page Layout switches from Fullwidth to Highend Options Settings; the alternative page titles and image I upload disappears; and the changes I make to the URL are erased and something totally random is substituted in. There may be more, but these are the ones I noticed. A totally frustrating problem that is sending me backwards!