My Psychopsis versteegianum has pretty flat, unimpressive p-bulbs, but my Pyp Mariposa (papilo x Kalihi) has fat, round bulbs. Post a picture. We can better answer you if we can see the plant. Diane's our Pyp expert - she's got a number of different species. And that's important, because there seems to be a bit of plant variation between the different species.