Here is Oregon, Independents get there own ballot with just the initiatives on it, not the primary ticket. So, dems get a ballot with the dem primary slate plus the initiatives, repubs get the repub slate plus the initiatives and everyone else who is registered to vote gets just the initiatives.
Cynical shitheads pushing unpopular initiatives and constitutional changes deliberately try to have these votes during primaries, because the unaffiliated and the lazy are (presumably) disengaged and less likely to vote.
Sometimes the magic works. Sometimes it doesn’t.
When it doesn’t work, they scream FRAUD!!!