Nevada in 2020 had plenty of Trump/Yes voters on an amendment to repeal the state’s constitutional SSM ban, with Storey County, Douglas County, and Carson City being Trump/Yes jurisdictions. The amendment passed with 62% as Biden won just over 50%.
Do you have the link to results or a map? Or know of any other repeals voted on elsewhere? Not surprising that today gay marriage would outpoll Democrats in most states. But since most referenda on gay marriage were in the 00's, and gay marriage has become much more popular, and partisanship in voting has roughly stayed the same, it makes sense that there would be far more anti-gay anti-Trump than pro-gay pro-Trump.
There’s a map in this Wiki article under Constitutional Amendments. I believe NV is the only state so far to put a SSM ban repeal on the ballot, and is now the first state to repeal a constitutional ban.