Shape parameters is missing.
been asking for about 5 days now… lol
I just recreated your scenario by adding circle, going to model, selecting model shape, selecting shape to round, then selecting done(without hitting apply). this gives you a circle with a flat top.
Make sure you hit apply after selecting shape to round. lower degree setting will get a less aggressive oval and higher = more round (bubble)… with 90* being max
hit apply then show 3D/ then select done to finish