The latest version of Survey123 has new spreadsheets and have different placement of columns compared to the older versions. This would mean that just copying and pasting the old XLSForm to the new one would cause errors (and believe me, I have encountered this myself!). The way I got around it is to copy and paste one column at a time paying attention to the column names making sure that they match. I got errors because I copied and pasted all at once with the columns for Calculations being put into Relevant into the new XLSForm.
Let me know if this works. If not, could you share the XLSForm if you are ok with it? If not, Esri Support is very helpful and confidential with this.