When searching for worlds or users on the website the first request is always (searching for tutorial word in worlds used as an example):

"&search=tutorial&n=12&sort=popularity&order=descending"

Then when you press the arrow to load more worlds it jumps to:

"&search=tutorial&n=12&sort=popularity&order=descending&offset=24"

In this search the search has been offset by 24 instead of 12 like it should be skipping over 12 worlds that should be included in the search.

As well as for the fact that the search for tutorial only has 21 results meaning trying to load more just does nothing.