That was because Rick Berman was being a fucking creep to Terry Farrell. According to her,

The problems with my leaving were with Rick Berman. In my opinion, he’s just very misogynistic. He’d comment on your bra size not being voluptuous. His secretary had a 36C or something like that, and he would say something about “Well, you’re just, like, flat. Look at Christine over there. She has the perfect breasts right there.” That’s the kind of conversation he would have in front of you. I had to have fittings for Dax to have larger breasts. I think it was double-D or something. I went to see a woman who fits bras for women who need mastectomies; I had to have that fitting. And then I had to go into his office. Michael Piller didn’t care about those things, so he wasn’t there when you were having all of these crazy fittings with Rick Berman criticizing your hair or how big your breasts were or weren’t. That stuff was so intense, especially the first couple of years.