When leveling Take Aim up while its active effect on, it will not level up properly. Upon using up the 1 attack with doubled range bonus, your attack range goes back to whatever the level of Take Aim was before you leveled it up, so you effectively are stuck on that level.

1. Level up Take Aim to level 1.
2. Cast Take Aim
3. While having the active buff, level up Take Aim to 4
4. Use the active buff by attacking an enemy
5. Check your passive range bonus from Take Aim

Result: Take Aim passively gives you its level 1 range bonus, instead of its current level.

Expected: Take Aim should update the passive and active bonus to the current level upon leveling it up.