Weird Rename Issue

What am I missing here?
Problem: I want to move files to another folder as they are created. These files have a timestamp that's the time of day. They are put into a folder which is named the date. As a result, I will have conflicting file names when two files are created with the same time of day to the minute.
Solution: Rename them to include the date, or the folder name (doesn't matter to me.) So I include a RENAME action with pattern <date added>-<name><extension>
Expected outcome: File 14-34-50.m4a is renamed to 2019-10-3-14-34-50.m4a
Actual outcome: File 14-34-50.m4a is renamed to 2019 2019-10-31-14.0-34.0-50.m4.0a
Why is ".0" being added to the end of each element?
Problem: I want to move files to another folder as they are created. These files have a timestamp that's the time of day. They are put into a folder which is named the date. As a result, I will have conflicting file names when two files are created with the same time of day to the minute.
Solution: Rename them to include the date, or the folder name (doesn't matter to me.) So I include a RENAME action with pattern <date added>-<name><extension>
Expected outcome: File 14-34-50.m4a is renamed to 2019-10-3-14-34-50.m4a
Actual outcome: File 14-34-50.m4a is renamed to 2019 2019-10-31-14.0-34.0-50.m4.0a
Why is ".0" being added to the end of each element?