Player ratings decreasing after they've been subbed...

Something I thought I'd spotted before, so I decided to check carefully. Have a look at these screenshots:

With just shy of half-an-hour played, my midfielder Jeong Jae-hoon has picked up a knock, and, not willing to risk him getting seriously hurt, I substitute him. When he comes off, he has a rating of 6.9, as, in the time he was on the pitch, he played pretty well.

I go on to win the game, and at the end of the match, we take a look at my players ratings, and JJH has....6.3...wft?

Whats going on here. How can he play worse when he's not even on the pitch?

I'm pretty sure Chi's rating decreased as well, but I don't have a SS of when I subbed him.

This is a problem I have noticed but I thought I was going mad,

Anyone know what's going on?

This is a known issue and is under review.

Good to know, thanks skorp

Maybe its cos he doesnt like being subbed and he didnt do well on the bench

I've seen the exact opposite happen with me. Say for example a player has a rating of 5.5 and is substituted at half time, their rating will sometimes rise to 6.4 when the second half begins despite them no longer being involved in the match.