Hi Wendy and welcome to the forum 😊 Most acers are better off with dappled shade as well as being sheltered from the wind. That’s probably been frazzled by too much sun. .
“I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh
Full sun will damage leaves especially if newly planted as it hasn't got the root network of an established Acer. You are also being much more generous than I am with mine!
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Most acers are better off with dappled shade as well as being sheltered from the wind. That’s probably been frazzled by too much sun. .