First start with your post #13 attachment. Then try with post #16 or post #18, whatever …
According to post #18 it should work only with its directions well followed.
Once it works, delete the two source .xlsx workbooks then copy a small number of other source workbooks, let's say a maximum of five
in order you should compare the result ant their contents.
For each issue found, isolate the source workbook in a specific folder then try a new source workbooks set.
At the end, you will have to analyse the workbooks in the specific folder, why they do not match your post #13 neither your explanation,
if any logic / strategy can be applied for an automation. As a reminder : ♪ no logic, no code ♫ …