The app has a weird glitch when applying tips that WAY over calculates the tip. I always tip my driver's well, but 20% of $25 is not $9.40. I have absolutely no idea how this is going unnoticed, and I'm sure some drivers make out well because of it (they deserve more pay anyway), but the tip calculator outright does math completely wrong. Once I had an order for $40 and it said a 20% tip was nearly $17. It's broken.