Hello,
it's hard to say, from the picture you are posting. However yes, the photographs should overlap more than a bit one with the other, for Metashape (or any photogrammetry application) to be able to align.
You should have two adjacent cameras overlap by possibly 40/50% of the image. Try not go below 30% of overlap.
If you don't have enough cameras to complete the full cylinder with your favourite radius, try enlarging the radius so that each camera shoots a bigger portion of the subject, since you can't unzoom.
50mm is quite long focal length, for instance my scanner has 1.3 meters of radius and I use 24mm fl in order to cover the people in an optimal way. With 50mm you need a much larger radius than what I have.
cheers