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I have attached the image from the 2nd night (left) rotated to match the final image (right, extremely stretched). In the left image you will see how it ends along the gradient-jump line of the right image.
What I always do when imaging over multiple nights is to try to rotate the camera to the identical orientation relative to the scope. Assuming the scope always goes onto the mount the same way, you will be imaging the sky in the same orientation. This way the rotation between images is kept minimal. You seem to have about 110 degrees rotation between the image 2 and the final image which gives you quite a significant area of non-overlapping parts. The final image matches the orientation of the first night.
Your nights 2 and 3 have almost the same orientation but your first night is quite different. If you don't like the extreme cropping you will get by choosing "Intersection mode" you could try stacking only nights 2 and 3.
Keep in mind that I may not be correct. Try stacking first and see the result.
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