I was surprised to see that a moderator closed the old steam icon thread and mentioning that we have sent the icons and there is not much we can do.
First, don't close the thread when the problem is not yet solved. Second, there is something you can do. You can actually contact steam about your product. Don't you care about your product?
Anyway, good news, episode 2 and 3 icons have been corrected.
Bad news, episode 1 is still the old icon which is not uniform with episode 2 and 3.
Here is a screenshot for your viewing pleasure: