Blend issue

 From:  jmi
Hi, I tried to blend two cylinders together, so that a section of torr connects them. It works fine at one end of the cylinder, but not at the other (make a kind of bulby shape). Are cylinders oriented? (both ends not identicals?).
The funny thing is that is I flip the cylinder around (rotate 180° from the centre), it works ok, but not anymore at the other end!
I'm kind of new user of MoI, so might missing something obvious.
Thank for any help