Data format error on refreshing data from Excel

I have a table of Sales, that contains column of Invoice number. The data contains numeric and alpha numeric invoice numbers

(2245568, M-25874, 225984-V, etc...)

Have been able to import the Excel and refresh  with no problems.

Yesterday began receiving an error "DataFormat.error We couldn't convert to Number..."

Seems that it changed or thinks the Invoice Number column is a numeric column.

I went into the edit query , and saw that the column type was changed to  123(numeric), and changed back to ABC text.

Still getting the  "DataFormat.error We couldn't convert to Number..."

I upgraded to the September release in between allof this.

Any help would be greatly appreciated.

Thanks