I've seen problems where up votes outnumber down votes 5 to 1, and I've seen the reverse, with most people giving down votes.

Right now, people who inject bad problems into the pool are rewarded. Could you take the worst 5-10% of problems, based on votes, and deny rewards to people who write bad problems? Otherwise it's rewarding bad behavior, and the bad problems won't stop.

A recent example is an easy problem that asks "how many students need to move". But the example contradicts that wording. The person meant to say "compare the given heights to the heights in sorted order", or something similar. The down votes heavily outnumber up votes, as people agree the examples don't match the description.