Is inadvertant contact on a force still interference?

[jicecone]

Not quite sure what you meant by "After he has made the force and is transferring to throw to first, he contacts R1."

This makes me question who contacted who?

If the runner by standing on the bag, caused F6 to alter the play then yes, I also have interference. However, if the fielder crossed the bag and ran into the runner that was trying to get out of the way , then I have nothing.

Also, from what I read, the runner may not have altered or interfered intentionally but, he did interfer and he did alter the play. Intent has nothing to do with it here.