Matchmaking Bug

I was at 10 star at vs attack and then I started matchmaking but after 5 second I cancelled matchmaking, I came to lobby and after few seconds I tried again but it was showing matchmaking is not possible as a match is ongoing , I was like what is this when I am in lobby how a match is started and if you had find opponent why am I in lobby , sick of this bug for a while happened 4-5 times with me , please fix this