You can edit an incorrectly or not at all assigned variant with the context menu command Modify link.
Click on the Modify link command in the context menu.
-> The PARTsolutions characteristic attribute table opens.
Mark the nearest line (M20x25).
Adjust the corresponding value for the variant on the right (here in the example 25 to 27).
Now the variable values correspond in the PARTsolutions catalog and in the CSV catalog and the link is marked with "100%"