Here's why and what it could be:
Possible intended meanings:
* "Le encantan": This means "He/She loves them" or "They love him/her." It uses the third person singular form of the verb "encantar" (to love, to enchant) and the third person singular pronoun "le" which can refer to a masculine or feminine singular person.
* "Les encantan": This means "They love them" or "They love them." It uses the third person plural form of the verb "encantar" and the third person plural pronoun "les," referring to multiple people.
* "A él/ella le encantan": This means "He/she loves them." It uses the preposition "a" followed by the pronoun "él" (him) or "ella" (her), then the third person singular form of "encantar" and "le" (to him/her).
* "A ellos/ellas les encantan": This means "They love them." It uses the preposition "a" followed by the pronoun "ellos" (them, masculine plural) or "ellas" (them, feminine plural), then the third person plural form of "encantar" and "les" (to them).
In summary:
The correct form depends on the subject and object of the verb "encantar." You need to consider the gender and number of both the person who loves and the thing(s) that are loved.