Whatever happened with the marry/bff heart/plus in the last update has caused some bugs in the way it works.
One bug I have previously noted in this thread:
If you kick someone, the kick symbol displays under the heart:
There's several bugs where users in PC have the bff symbol as well but I don't have a screenshot/repro for this (yet).
There's a probably a few more I've seen but I haven't encountered them again, I'll add them here if I do.