all the message's height has increased by 1

[zenghao306]

At the table [receipts],all the message's height has increased by 1.for example,the message [bafy2bzacea757tsgvogg3ngqui6tdwlx54u3y4qupxg42rzxljhldksfxs4us]'s really height is 335529,but recorded 335530 in the talbe.

[frrist]

This is expected and here is why:

The message receipts in a block header are the result of executing messages in the block's parents -- this is why the receipt field in a block header is called ParentMessageReceipts

The Filecoin VM interpreter orchestrates the execution of messages from a tipset on that tipset’s parent state, producing a new state and a sequence of message receipts. The CIDs of this new state and of the receipt collection are included in blocks from the subsequent epoch, which must agree about those CIDs in order to form a new tipset.

• source filecoin spec