This is why I told my son he had to fill out the sheet that the common app provides for your letter writers to have information about you.
It’s also why I require anyone for whom I’m doing a letter to send me something like a CV or resume. I often have to end up asking them additional questions as well. I don’t have to show them the letter to ensure that everything is accurate.
One trend that I HATE, which I’ve only seen at PhD level and above: the letter writer asks you to draft your OWN letter, which they will then edit and sign. I absolutely hate that and I was mortified when I was asked to write my own once. It was awful. When that same person asked ME to write a LOR for them some years later, I was nice enough to not ask the same of them! I really hope that trend doesn’t trickle down to HS. That would suck.