Oh, true. And yes! You would be correct. Actually, I think I figured it out now that you said that.
The lyrics were divided up like:
I must have accidentally assumed かも was just かも in that context (like in casual speech) and 知れないじゃない was a new part in the sentence. Now I see what happened, haha. The whole thing was 「～かも知れないじゃない」which is like "might ... isn't that so?" Oh, wow, I'm really bad at this. lol