I don't know why, but the value of my champion shards seems to have gone down.

So I had Annie in Wonderland, Riot Graves, Ivern, and Gangplank shards. I got all but the Annie in Wonderland shards a week ago (I've been holding on to the wonderland annie shards for a couple of years now and nothing seems to have happened to them over that period). I got on today and for some reason all of my shards disenchanted for a smaller amount of essence (both blue and orange). Anything happen that I'm not aware of?