So you have a public repo. You're happy with your code coverage, your test status, and your documentation status, but one or more badges is telling people something is wrong:
GitHub caches your badges, but sometimes it doesn't work as it should. One possilble solution is to change your badge url from:
You're now using
shields.io for your badges, which does the caching on their end --and properly, at that.
This will fix your problem.