On longer posts I always compose them in Outlook, save in a draft folder and then post them when complete. Could this be result of the cut-and-paste operation?
They didn't appear this way 7.5.8. Or when pasted into the New Post box. These should be single quote and dash.
Then you will need to make a decision to either switch back to iso-8859-1 or attempt to convert to utf-8
Basically if you wish to stay at iso-8859-1 GOTO the UBB CP select languages and then edit generic.php The first entry probably has utf-8 then just change it to iso-8859-1 save and exit.