Issues with bold tags in InDesign CS

Does anyone know why InDesign doesn’t like the text “” from AppleScript? I have a script that converts text from an ID document to HTML. When I try inserting the starting bold tag, either nothing shows up, or an unreadable character. I worked around it by inserting <?@?@?b> and then later doing a search and replace. However, sometimes the tag still turns into the unreadable character(in ID it looks like a box highlightedin pink). My script is working pretty good, but I don’t want to jurry-rig it like this if I don’t have to. Thank you for any insight you can give.

P.S. There are no problems with Italic tags.