Hi,
We have confirmed the Financial Dimension of each transaction is identical and we only have 1 posting profile setup. (This was the initial checking, because we are aware the posting profile and financial dimension can impact the settlement in this result. Attached a posting profile and FD print screen in the original sample post)
According our developer's finding, it seems to have a counter of settlement, once the same voucher is being settle more than once, system will create the extra transaction line.
below is a link more detail of the transaction