Hi Donna. Sorry to hear that you have lost work.
When you do a full save, the result should be the profile as edited, with a prominent banner at the top, like this:
Do you remember whether you saw this? If you did, but the changes you made are not visible on the profile, there could be a system bug, or perhaps more likely, an error in formatting the biography text (like mismatched ref tags) has hidden the changes you made.
If the banner pictured above was not present, then for some reason the full save has not actually been done, or has not worked.
In any case, I would suggest that for a little while each time you do a full save you check that the banner is present. It might also be a good idea to look immediately at the Changes for the profile after each full save, to confirm that the edit you have just done is listed there.