SE likes its sites to have a ratio of at least one question vote to three answer votes. The problem arises for me in that when I upvote a question, I tend to upvote most, if not all, the answers. (the reverse is not true.)
On most SE sites, there is an average of 2 to 2.5 answers per question. So I can upvote a question and two answers, and still have room for some "spare" answers. But IPS has an average of 4.5 answers per question. So if I upvote four answers per upvoted question, well you see the problem.
There are several alternatives, none of which are palatable 1) be more selective in upvoting answers 2) seek questions with few answers (and avoid questions with many). 3) Upvote a number of questions without upvoting answers. What should I do?
Or should SE be expected to relax its preference, because this site gets so many answers?