The current replication study aims to examine the effects of learners' attention to lexical and grammatical forms on meaning comprehension while listening to a passage in Spanish. The registered protocol and materials in the aural mode from Morgan-Short et al.'s (2018) multisite replication study were used, with first language (L1) Chinese-second language (L2) English participants (N = 122) learning Spanish as the third language (L3). The results partially reproduced the previous findings that there was no effect of attending to a lexical item (sol) on meaning comprehension. However, a small to medium effect was found on comprehension scores for simultaneously attending to a grammatical form (la). This finding reveals a site-specific effect with learners from different L1 backgrounds, suggesting that learners' attending to a grammatical form absent in their L1 is detrimental to their meaning comprehension even if this form exists in their earlier learned L2.