Probably because they ripped people like myself off. They refused to swap my coins after I gave them the private keys. They'll probably do another swap this year and steal more peoples coins. The person who did the swap told me they didn't know what a private key was or how to use it. Very risky coin to get involved with.
The old chain is dead and burried, we can no longer verify people's claim about their coins, and there are a lot of false claims. I don't say this is the case for you, but a lot of scammers tried.
However, there has been an automatic swap on Bittrex for everyone who sent their coins there for about 3 weeks, and it was notified in advance. Also, it's hard to have missed that Shift has been attacked twice in September, even crypto press talked about it. I feel sorry for you it's what happened to you. In an ever changing environment like cryptocurrencies, every cryptocurrency holder should check the news about their portfolio at least once a week.
After that, we offered to manually swap for even longer than 3 weeks. I don't know the details about you, but now the person who did the swap is no longer around, probably tired of all the trolls that this environment inevitably generates...