I'm running an unchanged workflow that has run for 3 months successfully to read in multiple Excel files from a directory. The workflow had been modified from the solution to this post Read multiple Excel files with different sheet names.
Each of the files contains 2 tabs. The Dynamic Input tool is configured to look at the 2nd tab in the first file in the folder, but with this month's files it is reading in the fields from the first tab.
I don't understand the Dynamic Input tool enough to understand what is going wrong. The files are in the exact same format as the previous month's. I am running two separate workflows, one formatted for last month's files and another for this month's files, but this month's files are failing.

Below is the comparison of the fields returned by the 2nd Dynamic Input Tool for both workflows. There should be 23 fields names returned.
Working results returning the 23 field names from the 2nd tab:

Failing results returning 7 field names from the 1st tab:
