I challenge you to find one.
One particular example of those "evolutionary accidents / coincidences", is homosexuality in males. Here are two studies claiming that homosexuality in males correlates with fecundity in female maternal relatives:
So, appear to be some genetic factors that prevail, because they make women more fecund. Coincidentally, they also make men homosexual, which is both an obstacle to reproduction and survival (not only due to the homophobia of other's but also STDs. I presume, that especially our (human) genetic material is full of such coincidences, because the lack of them (i.e. the thesis that all genetic factors that prevail in evolutionary processes only lead to higher reproduction and survival rates and nothing else) seems very unlikely.
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But you also said:
What does that add up to? That moral values are arbitrary products of evolution, THEREFORE they are not objective or universal?
Indeed. The claim that moral instincts are products of evolution is a descriptive claim. It leaves the question open as to whether inherited instincts are what is actually morally right. That is a normative issue. It is not a corollary of descriptive evolutionary ethics. In general, you cannot jump from the descriptive to the normative. And I don't think Darwin did that. I think the positive descriptive claim and the negative normative claim seem like corollaries to you because assume morality can only be one thing,
Firstly it's not either/or.
Secondly there is an abundance, not a shortage, of ways of justifying normative ethics.
Yes, moral values are not objective or universal.
Note that this is not normative but descriptive. It is not saying what ought, but what is. I am not trying to justify normative ethics, just to provide an explanation of where our moral values come from.
(Thanks for the comments, this all adds value.)