Maybe they triangulate through your mom?
The best way to investigate this issue is to go back through the steps to create your import files. We’ll need all three files: list, segments, and triangulations. Instead of copying and pasting, save the files as CSV files. If you create a new DNA profile for your father, you will see instructions for how to create the CSV files.
If the other two kits are not showing up in the CSV files for your father, then it’s most-likely because they don’t match him. If they do show up in all three CSV files, especially the triangulations file, but they aren’t showing up in RootsFinder, then it could be due to a bug on our side. If you will send the files to dallan at rootsfinder.com, and tell me which kits are in the files but aren’t showing up in RootsFinder, I will investigate the issue.