Receiving FaceTime calls from someone who showed me they never made them

Since about 5 days ago, I have been receiving FaceTime calls from a friend, at least once a day. Last night it was at 2 and 5 am. However, the only way these calls come through for me to see them is when my Mac is open, these calls have never come through on my iPhone to answer from. It is only when I open my call log on my iPhone that I can see the timestamps of when I was called. I asked her, and she showed me her call logs and it was clear she never made these calls. I am not going to answer the calls either. Could this be related to my devices or hers?