There is a fee for this transaction, so you will receive approx. 0.99499...LVL. The fee goes to the marketplace. In these images, the fee goes to http://beeswap.dcity.io and those fees get paid out to people who stake BXT.
This fee actually doesn't go to the marketplace but to the liquidity providers (https://hive.blog/hive/@aggroed/fee-structure-changes-coming-to-hive-engine)
The fees from swapping HIVE<>swap.hive go to the market place and 50% of that is paid out to BXT stake holders.
Although I understand the confusion as the swap % and LP transaction fee are the same and the wording in the BXT whitepaper isn't ideal to distinguish the two either. The LP fees weren't introduced yet so it didn't matter back then..