Bests & Worsts Reviews from Amazon

i've bought the rx relief earlier this year off the crocs site and loved it. i notice amazon had a dropped down in price for what i thought was the same model but it turns out, its different. when the shoe arrived, appearance wise, it looks the same but feeling wise, its much stiffer. the rx relief from the crocs store had way more heel cushioning and overall more bounce. also, i notice the tag on this shoe only saids "relief" rather than "rx relief". according to the crocs site, there is no regular "relief", just "rx relief" and the model #10003 matches on both sites. to me, everything seems fishy and the only conclusion i have is this is a super old version of the rx relief and therefore doesnt provided the extra cost benefit (i'm guessing that's why it cost me $25 vs $40). ps. there's also another review here on amazon who noticed the difference between the real crocs rx relief and this crocs relief.