Connection Progression shows a question mark

[MartWClimber]

I've got a workflow that I build with a couple of tools in it. At the end of the workflow I use a union tool to union everything together.

on the connection Progression, that is shown when I run the workflow, I see how much data goes through the flow. at one point in the union tool I get  the following:

10%  ... GB

50% ... GB

75% ... GB

?

Workflow is complete.

can somebody tell me if I need to worry about the question mark in the Connection Progress?

because from what I can tell the data is getting unioned together.

[PhilipMannering]

Does it finish on 100%? If the number of records going into the Union Tool equals the number of records coming out, then I wouldn't worry about it.

[MartWClimber]

the number 100% doesn't come up. indeed the unioned records is the same as the input amounts summed up