This is related to support case (175976). Basically, while ingesting through Fivetran, we experienced trailing whitespaces added to the data on almost all columns.

The Engineering team concluded their investigation after reproducing the issue internally found it's from LogMiner. The query matches without the whitespace but the LogMiner insert is how they are added in.
 
To improve this behavior, the team will have to work on it under a feature improvement project.