I do not use either of these mods. But if you can not find the "<b>" in the templates they may be adding them to the template while it is in the cache. You might need to look in the "Mod's" php code for where they are appending/replacing text in the template to the template cache. Not sure why this just isn't done in CSS, but again I haven't looked at the mod.
Really just a dumb guess.... Hopefully, someone that really knows the mod can help.