Welcome to the world of LAWL, sweetie-you'll never get the same answer from 2 different centers
Now-there's no reason not to mix veg and nonveg proteins. i do it all the time. Just keep doing what you're doing . . . . Some of the counselors just pull this "info" out their a#s . . . .
The counselors went through a 2 week training course that mostly involved selling their products . . . .99% of the clients no more than they do about nutrition. Anyone who's been a career dieter (and most of us have been), have done all the research . . .
Don't get me wrong-some centers and counselors are great . . .just keep in mind their motivation (selling products).