Likes Spread shows the difference in the number of likes between posts.
Low levels of Likes Spread might mean that an influencer may artificially boost the number of likes per post: for instance, purchasing a certain amount of likes for their last reels.
On average, followers like some posts more than others, as one piece of content is more interesting than another. That's why it's suspicious if all posts have the same amount of likes.
Likes Spread is closely related to the Likes-Comment Ratio, another metric that helps detect artificial activity by comparing the balance between likes and comments across posts.