My messages disappear when I click on them.

So every time my phone turns off, and I put it on charge, if I have a message, it pops up on my notification screen. I can read it then.

But when I click on it, the message disappears from my phone, and the badges on the iMessage app also disappear. THE MESSAGE ALSO VANISHES. And I am unable to retrieve it. It doesn’t even show up in my thread.

(This has happened thrice)

Pls help.