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Two possibilities that I can think of.
1. Are you sure it's a yellow squash that you have, and not a green one, such as zuccinni??
2. Maybe they are not ripe yet, and you need to give them a bit more time.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them