Can't see match history?

Ok this is weird but I had someone added who I removed... So like I was curious if they were still playing, so when I go look at their match history it does not show that they have been playing even though I checked with OP.GG and they have been playing, but the odd part is that it shows matches from like June and its only ranked matches and its the matches I duo'ed with them in... It does not even show our norm matches... LOL, I don't get it? Could it be that maybe they ended up blocking me now and thats why? I dont want to add them back to find out but I just want to know why it does that?