My Phal. cornu-cervi is one of my favorites! I do recall when I first got it, it did take a while to adjust to my growing conditions. But now it is always doing something interesting and is in almost perpetual bloom from one of the many inflorescences or basal growths. It even started a keiki at one point, but while I was waiting and thinking about cutting it off to plant it separately, it made its own decision to put those roots right down into the medium, so I've left it there.
It's a really fun plant, and for those of us who are space-challenged, yes, it grows but seems to stay pretty compact. I'd love to have another one or two or three.
In your case, I do think a couple photos would be helpful.