I think the explanations is I'm still in the hpnogogic states without SP and still didn't transact fully into the dreams..
I advise you not to worry or think about SP. The things that may accompany a WILD attempt, such as tingling, buzzing, imagery/hallucinations, and other stuff are not even sleep paralysis at all. They are normal bodily sensations that you notice while your body is falling asleep but your mind is awake.

There are many people who don't even notice anything while WILDing, mostly just a little bit of tingling or something. The important thing in WILDing is to focus on the mental aspect and the dream, and not the physical aspect and the sensations (though you can certainly use them to let you know you're almost there).

Good luck!