If you want to calculate with some exported data from your CoinTracking account in Excel, please adjust the number format depending on your region (e.g. US number format or European number format), especially the 1000 separator (comma or period or no separator) and a decimal separator (comma or period) and a specific combination of the 1000 separator and decimal separator.
You could change the number format of your exports here before exporting.
E.g. in the US you need to choose comma as 1000 separator and period for decimal separator for calculations in Excel afterwards.