I found a bug where the script works fine the first time I use it, but if I try to click "WHO WANTS?" after clicking "WHO OWNS?" (or vice versa), it'll incorrectly give me the same numbers. The same thing happens if I change the App ID and click either button. The only way I've found to fix the problem is to click "RESET CACHE" and then refresh the page. See the example screenshots below:
First, I clicked "WHO OWNS?" and got the correct number of owners.
Then I clicked "WHO WANTS?" and got the same number as the owners.
After clicking "RESET CACHE", refreshing the page, and clicking "WHO WANTS?" again, I get the correct number of people who want the game.