Hi! I crossed the UFO purple with some red annuums (some F4 from one old project, with a cayenne-like shape) up to F2. Then I abandoned the project as the shapes obtained were not homogeneous on the same plant, and the bitter taste of UFO Purple did not deserve to continue the line.
Here are some photos in which you can see different shapes. On some plants the shapes were slightly different, some more ufo-shaped, others more wrinkled, others more elongated (like the other parent).
Additionally, some UFO crossings in F2 have lost the purple trait:
I think some of yours crossed with another cultivar.
However, with other varieties I have sometimes had different fruits on the same plant, for example this one should not be shaped like a pumpkin (I don't remember the shape of the other fruits on the plant, I think a classic bell pepper or a bishop's crown hat shape). This anomaly should be caused by environmental reasons.