On Stack Overflow, I've noticed that clicking on a question's score will display the total number of upvotes for that question, as well as the total number of downvotes. However, I've noticed that clicking on a question's score on other Stack Exchange sites doesn't display the total number of upvotes and downvotes. Is there any other way to display the total number of upvotes and downvotes for Stack Exchange sites outside of Stack Overflow?
You need 1000 rep to see vote splits (750 on beta sites).
If you're only seeing vote splits on Stack Overflow, then you must have >1000 rep on SO and <1000 on the other sites. Privileges are determined on each site by your reputation on only that site, so you will need to earn 1000 rep on any site you want to see vote splits for.