Hextech skin changed?

So i buy a load of skins and collect skins and i remeber getting hextech renekton when it came out and then i stopped playing for a bit and got back into league and i just recently noticed i don't have it anymore but i have Hextech J4 instead. I never crafted hextech j4 and i know i didnt do it as a mistake otherwise if i did im stupid.

has this happened to anyone else?