Append Query duplicates some columns

Hi there,

I have two identical tables (daya from FY2016 and FY2017) and am using an Append Query to merge them into a new combined table.

Using the Append Query function, there are 4 columns which are duplicated at the end of my new table. Having read up on this it's my understanding that this happens when the columns in the 2nd tabel have no match in the first table, and they are then added as new columns to the combined table.

Here's the kicker - I have checked (and triple checked) that the column names and data types are exactly the same. Of my ~40 columns, only these 4 give me a problem.

Any suggestions on where I could go and dig a little deeper to uncover my problem?

Thanks

William R.