Strange behavior with MULE and punctuation on 21.0.65,Solaris

Hello, I'm seeing very strange behavior when typing away. Sometimes, when I type some punctuation, such as a comma or period, if a space follows it,a space gets put before the punctuation and the cursor moves to the left of the space. For example: A sentence . To get it to not do that, I have to type a letter right after the punctuation. This is OK.Note lack of space between sentences. Something even stranger, it sometimes makes the text like: The comma keeps following the next phrase ,this one right here. I have not used any input methods during this session with XEmacs. Any clues? Thanks, Andy