You are using the count() function to determine $liked_count. This function is meant to determine the number of items in an array. But it appears that the value stored in the liked_count postmeta is not an array, but an integer count. When you do count( $p ) where $p is an integer, you get 1 no matter what the integer is.
Try this instead:
$liked_count = (int) get_post_meta( $id, 'liked_count', true );