I love how on the fediverse #onHere the number of "likes" a post has have little impact on the reach of the post AND the number is literally subjective.
Your local server can only count the likes it knows about. If you aren't federated with someone who likes a post you see that like isn't included in the total. So, the numbers depend on who is viewing the post.
That said, I am curious about absolute numbers, a stats server could spider out, federate with everything and post most liked posts.