Hi, Teamhoward17, and thanks for using the Apple Support Communities. It seems you're having an issue with your Messages app and will be glad to look into this with you further.
We'd like to clarify, as it isn't possible to actually hide messages within the Messages app on your iPhone. Are you referring to the "Hide alerts" feature? If so check out this article:
Use Messages on your iPhone, iPad, or iPod touch
Pay close attention to the section titled, "Turn on Hide alerts." You will follow those same instructions to turn off hide alerts.
We hope this helps.
Cheers!