Clearing bars is the pole vaulter's bread and butter. But just like you can have an amazing miss, you can also have a frustrating clearance. Generally, those are cases where your skill just didn't show up, but you had enough luck (or brute force) to make the bar anyway.
In college, my coach discussed the concept of a pride line, which is essentially a standard of acceptable performance. Any performance above that standard could be considered reasonable. Below, though, is just unacceptable, inexcusable, and shameful.
Where that line sits will vary from person to person, and situation to situation, but the most frustrating clearances are the ones where you performed below that threshold, didn't deserve to make the bar, and cleared it anyway. A make is a make, so you take it, but sometimes it leaves a bitter taste in your mouth. Serves you right. Wake up and make it count next time.