The story has always been that Kody kissed Robyn before their wedding because Christine told him to. It had been awkward for them kissing for the first time at the ceremony itself. But I had assumed that now that they were broken up, Christine would walk that back and say she lied to save KR's reputation. But, nope. Looks like it it was the truth.
Since Kody kissed Meri and Janelle before marriage, he probably would have kissed Robyn regardless. But still, interesting.