Brian
I don’t know the answer to that off the top of my head. However, one thing I have tried in the past that has corrected things like this is to create another sheet in the workbook to be used for importing, select all of the rows and columns in the sheet you are using (with the formulas) and paste into your new sheet, but use Paste Values in Excel. After doing that, try importing again with the ‘values only’ spreadsheet.
The other thing you could try is to create a simple microflow to parse the decimal values when you import the spreadsheet. In that microflow, explicitly convert the decimal values to strings with the formatDecimal() function. Use this microflow in the parseWith for the correct columns in your spreadsheet. Seems like maybe you have an implicit conversion of some kind taking place, and this will make that conversion implicit.
Hope one of those ideas helps.
Mike