I was planning to get Encore #11 Skywarp & Thundercracker but then I watched this review on youtube. YouTube - g1 transformers ENCORE 11 thundercracker & skywarp The reviewer says that there is some kind of grease on the tray and on one of the figures and that it prevents the stickers from sticking. It's 1 minute into the video. I was wondering if anyone else had this problem with these and also if it's a problem with Encore in general? Thanks.