Combining aspect ratios. Drone+iPhone

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Firstly I apologize for the handheld photos, I wasn't able to get a screenshot. I'm trying to combine footage from a DJI drone and my iPhone in vertical orientation. This seems to happen whenever I combine the two. Both are shot in 4k. I set the projects aspect ratio to 9:16, which crops into the center of the drone footage, and should leave the 9:16 iPhone footage as is, but it's squeezing the width to something like 3:16. The phone clips looks normal at rest and in the timeline but distort during playback. The problem persists in the exported file, but doesn't appear to an issue if I open the project from my phone. What am I doing wrong?