I had 18 hearts and used 16 leaving me with 2 hearts but the exclamation point doesnt disappear anymore
This has been reported several times but doesnt effect all users all the time, sometimes mine is fine but other times it does the same thing. Im on iOS.
Until they find out whats causing it to happen/replicate the issue, we have to make do.
Dont worry Im OCD with things like that and it annoys the hell out of me