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The zucchini, if they died after a few weeks, may have had vine borers. This article can help you with that: https://www.gardeningknowhow.com/edible/vegetables/zucchini/vine-borers-zucchini.htm

There are many varieties of Zucchini and this may be the growing pattern of this particular plant.
Also soil and environmental conditions can effect how a plant grows.

https://www.gardeningknowhow.com/edible/vegetables/zucchini/growing-zucchini.htm

I have not found any research that shows this particular issue you describe.
If the the zucchini has no other issues, i.e. insects or signs of disease, I would not worry. Environmental issues can certainly cause various issues with fruit and vegetable shape.
If the zucchini is mushy, I would not consume and it may be caused by insects or fungus issues.
Practicing crop rotation is important and would recommend this for next year.
Here is a link to refresh you on the growing requirements.

https://www.gardeningknowhow.com/edible/vegetables/zucchini/growing-zucchini.htm

Depending on the size, it could be a pollination issue or the squash has simply reached their fully mature color. I imagine that the flavor will not be what you are use to from this squash now that they have changed color, but it will not hurt you to eat them if you want. Otherwise, you can just toss them.

It sounds like you have vine borers. This article will help:https://www.gardeningknowhow.com/edible/vegetables/squash/squash-pests-identifying-and-preventing-squash-vine-borer.htm

The seeds likely were from a hybrid plant so they will not resemble the parent plant.
It may be some version of a squash type plant.
https://www.gardeningknowhow.com/garden-how-to/seeds/non-hybrid-seeds-vs-hybrid-seeds.htm