Lepanthropsis astrophora question

[Pyewackit]

I have several Lepanthropsis astrophora that I've gotten from different sources. Most look about the same but 2 of them are extremely tiny. 1 third to half the size of the other plants. I don't think it's a difference in age since I have had one of the large and one of the tiny ones for about the same amount of time and they've grown considerably....become bushier but no change in leaf size or plant height. I've done a bunch of internet searching and reading but haven't found any information on differences within the species. I have seen references to "stalky" though and thought that might be a nickname for the larger variety of the plant. Can anyone please explain any of this to me?