hey here's a crazy thought for you, has it ever crossed your mind that someone may be pinching your plant and turning it to clones?
seriously now, without a picture of it what do you expect to get as a response?
maybe it's an animal that's been eating the leaves leaving only branches behind....
here's more....and that's no fun...since the plants are visible abandon the grow....i am sorry telling you that but your security comes first....why don't you try indoors?
you can look at them as they grow this way