This has maybe gone unnoticed since August is usually a “slow” month, but with the August release there has been a major change in SQL Server Management Studio and how it show the Live Query Statistics data.
The operator level percentages shown in the Live Query Statistics is now the ratio between actual and estimated rows, which means that the value can get way higher than 100%. The purpose of this approach is to make easier to spot places where cardinality estimation got it wrong for some reason, so that you can go and try to understand the problem and fix the query in order to improve performance or reduce resource usage.
A detailed post on this topic by Pedro Lopes of the SQL Tiger team is here:
https://blogs.msdn.microsoft.com/sql_server_team/operator-progress-changes-in-lqs/
Now that also the Management Studio is following monthly release schedule, the post done by the SQL Server Release Services team about SSMS really needs to be read carefully, just to be sure not to miss this small-but-huge-impact changes:
https://blogs.msdn.microsoft.com/sqlreleaseservices/tag/ssms/