scream tail glitch

I am playing Gard and I notice that scream tail's roaring scream attack sometimes doesn't work. I know that I had damage on scream tail, and I checked all my opponent's pokemon and discard pile and they had nothing in play that prevented damage on benched pokemon. This has happened to me a few times and is very frustrating. I just want to report this issue and hope it gets fixed and to ask if anyone knows how to resolve this or if there might be something I did not notice that causes this.