Hmm...
I was able to find https://hiveblocks.com/tx/94ab37c9124243448fc1ea8a507602afd371dbe7 this transaction that might be the one you mentioned. It appears so that we clashed :) I was doing some updates at the time to Swaps to add new features so it appears you sent 1.6 HIVE the moment I was working on it.
Sorry about that, but thankfully, it was not a bug. I sent you your 1.6 SWAP.HIVE back. :)