Not sure whether it's a "bug" per se, but in the mission selection screen for Community Authored missions, when selecting a custom filter and picking a rating per number of stars, those stars in the selection box look way too big.

In fact, you can't tell the difference between a 4-star and a 5-star rating because the 5-star only has enough room to show 4 stars (until you select that category, at which case the fifth star appears on a second line, underneath the box).