When posting pics, I can post 5 pics in a single message. For others is more or less. It might have to do image file size. Try posting 1 pic. And then 2, and then...
I would really like to see the vine splitting. As well as the new and old leaves.
I have a few guesses right now, but pics are the only way to confirm or discard them.
Also, how did you plant it? Did you discard the dirt that it came in? How long have you had the plant? How long until these symptoms showed up? Did you wait to plant it in the ground? Are you growing other plants? Did you see the roots as you did your process of planting it in the ground? What did they look like? What is your watering routine for it? I can tell you my watering routine down the closest half liter of water, and my schedule for my plants. Did you fertilize it? I'm not telling you to fertilize it or implying that you should have, I'm just asking. What kind of insecticide did you use? Roughly, how many hours of sun does it get on a clear day?
I can go on with more questions. The point is... The more info you give, the better chance you give people to eliminate and/or form more concrete and possibly correct theories as to why this is happening. Pretend this is like a doctor's visit. Tell us about the speed bump you hit on the drive home, and be honest about whether you strapped your plant in with a seat belt buckle.
I don't think squash hates you!
Hope we can help!