The Tiktok search ranking does this for every query. There is no obvious rhyme or reason for the sort. There's a filter button to change how it's sorted, but by default I can never figure out what it's doing.

I search for "retro pc":

1st result 47k views, 4 months ago

2nd result 457k views, 2 years ago

3rd result 9k views, 1 year ago

4th result 133k views, 1 year ago

5th result 1k views, 5 months ago

Make it make sense!