Errors involving universal quantification are common in contexts depicting sets of individuals in partial, one-to-one correspondence. In this article, we explore whether quantifier-spreading errors are more common with distributive quantifiers each and every than with all. In Experiments 1 and 2, 96 children (5- to 9-year-olds) viewed pairs of pictures and selected one corresponding to a sentence containing a universal quantifier (e.g., Every alligator is in a bathtub). Both pictures showed extra objects (e.g., alligators or bathtubs) not in correspondence, with correct sentence interpretation requiring their attention. Children younger than 9 years made numerous errors, with poorer performance in distributive contexts than collective ones. In Experiment 3, 21 native, English-speaking adults, given a similar task with the distributive quantifier every, also made childlike errors. The persistence of quantifier-spreading errors in adults undermines accounts positing immature syntactic structures as the error source. Rather, the errors seemingly reflect inaccurate syntax to semantics mapping, with adults and children alike resorting to processing shortcuts.