I forgot to suggest just rebuilding the module, that's fixed things for me before.
It's likely that something gets permanently written in the html (modules just essentially load chunks of code into the page based on your choices and merge it with the rest of the pages overall HTML) like a bracket that won't disappear.
(our writers (day job) use a similar interface to write their copy (they use the same exact tinymce module in their site design), often the keyword checksum won't work because something the module added to the code but didn't remove (usually a bracket)... tis kinda like when memory isn't cleared when a program closes blocking that chunk of memory on your PC...)...
And at Earthlink, 98% of the time the solution was to reboot the computer (in this case it's reboot the module or update javascript). Two things I do before I try to "tech" anything else. Just go in and copy all the numbers on the right of the product in the module and... re-enter them...
I'm babbling.
I'll stop now.
Please pull up to the next window.