Why is data duplicated after fetching from MySQL database when using 3 JOINs?

Question

MySQL

Hello.
There are 3 tables. Users , Posts, and Likes .
When I use JOIN (Posts+Users) everything works correctly.
But, when I connect MORE and the LIKES table, the data is duplicated by the number of likes to the table: Posts.
those. if a post has 15 likes, then that post will be selected 15 times.
Help solve the problem.
PS
Tables: Users - has a user_id (unique user ID) Posts- has a post_id, (unique post ID) and post_user (post author that links to users.user_id) and a Likes table that has only 3 columns (likes.like_user - like author, likes.like_id (object ID) and likes.like_object (object type - post, article, video or photo)
I hope I didn't write too vaguely. Thank you in advance)