[wp-pro] Bug in the system?

[GoodTherapy.org]

Strange, today the tag line on my WP is missing.   I was alarmed at 
first and wondered if we'd been hacked.  So I logged in and added the 
tag line, clicked "save changes", and voila, the tag line field was 
empty again.  I tried multiple times to add a tag line and each time the 
page refreshed the field was empty.  Some kind ok bug perhaps?  I'm 
running 2.5, maybe I need to update to 2.6?  Any one else experience 
this?  Any ideas about what I can do in addition to updating?  Thanks in 
advance for any help,  Noah  btw, i'm not a WP pro, obviously :)
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