A Bold Error

I have found that text that I bolded is not bold on some Kindle devices:

With the assistance of someone on another forum, I’ve determined that the error happens because Scrivener creates this code:

this is bold

instead of

this is bold

IOW, Kindle Fire devices don’t work well with a numbered font-weight.

Is there any way I can fix this within Scrivener, or do I need to have another step (or switch to a different system)?

Thanks,

Al