I would disagree. Those who don't want to end a sentence with a preposition would sayThe "two froms" are idiomatic and correct.
I think it's hypercorrection. I've caught myself speaking like that a few times myself.Not only are the two "froms" not correct, but even in very casual or dialectical speech I've never heard anybody say anything like that. People say it with just the "from" at the end.
Yes, I also find myself using the "double from". I don't really even think about it. It just comes out.I think it's hypercorrection. I've caught myself speaking like that a few times myself.