Does that mean
1) that you have defined a custom style and you change the text to use that style?
2) that you used the controls in the ObjectProperties page to change the specific text you selected?
Either way, the changes should stick, but I'm trying to figure out what to trouble shoot to figure out what's happening.
I asked you what fonts were supposed to be used by the styles, but I've figured that out now. I don't have that font and the controls work differently for me because of that, which I also need to fix.