Is thIs a glitch?

So I was playing just build and there was a few inappropriate builds but the 2nd one said I already had an out going report for the player even though I had not played BB in a week

Nope, not a glitch. It just means that they probably already have other people who reported their build as inappropriate. Iā€™m guessing this also means that only so many people can report the same person.
@Hlzyzptlk i summon u