This is a new bug with v.0.82b. The current style indicator in the toolbar (i.e. the dropdown menu when it isn't opened) 'sticks' when you move the cursor from styled material to unstyled material. This is very confusing, because it shows a style wherever there is no style.
I'm using Win7 Home Premium, 32-bit.
If this bug appeared with 0.8b2, it might be a consequence of bug #2949127:
https://sourceforge.net/tracker/index.php?func=detail&aid=2949127&group_id=170132&atid=853122
Working on it.
Confirmed, this is a consequence of the "fix" I made for bug #2949127.
Fixed with rev.213, to be tested with KompoZer 0.8b3.
-- kazé