This has also happened to me - my username on bricklink Kongzilla - with dinosaurs fossils to be downloaded for free and I find them here on rebrickable being sold by somebody else. The user with my designs: https://rebrickable.com/mocs/MOC-21635/Brickbrothers-Germany/skeleton-tyrannosaurus-rex/#info My creations on bricklink: https://www.bricklink.com/v3/studio/design.page?idModel=31473 Maybe check the dates of the first comment of my creation and the date this was submitted. There are six of mine that are stolen: the T-Rex, triceratops, Ankylosaurus, parasaur, stegosaurus, Pteranodon, and it looks like there are others that they have stolen from other people (the raptor, the mammoth) I have not allowed anyone to sell these designs without crediting me and allowing people to get the designs for free. Can you please take them down and warn this person not to take money and credit for other people's designs in future and also notify anyone who has bought them from this person of the situation. The may want their money back for my free creations.