Are all of your transactions from the end of 2013/early 2014?
It's possible that you were mining one of the many forks that developed in the early weeks after CAT launched. The founder launched the coin at a very low difficulty and used the same difficulty adjustment as BTC. There was a LOT of hash on the coin at launch and more than one million CAT were mined in the first weeks - and there were a lot of forks. Do you remember how you mined your coins?
It's possible that you were mining one of the many forks that developed in the early weeks after CAT launched. The founder launched the coin at a very low difficulty and used the same difficulty adjustment as BTC. There was a LOT of hash on the coin at launch and more than one million CAT were mined in the first weeks - and there were a lot of forks. Do you remember how you mined your coins?