As far as I understand, you use this action
https://prnt.sc/uduziiNow your characteristics are unloaded without the unit parameter
https://prnt.sc/udvfaqHow to unload this parameter via xls I wrote above.
For now, to resolve the issue, you can:
1) Set the unit of measurement for filters (as described above)
2) In order to correct the position of the goods in the box and upload to the site - you need to set up an action in product automation like this
https://prnt.sc/udvioqAnd then for such values
https://prnt.sc/udvj3q will change to such
https://prnt.sc/udvjplThen you need to update all products - this will work for you when loading products with samples and should correct all filters.
After that, the goods are uploaded to the site with the correct values.
That is how your situation is resolved.