When I finished my first book, Nowonderland, I was overconfident in my ability to proofread apparently. I read through it four times before I published it and thought I caught all my mistakes. However, I just read through one of my author's copies and found about ten more mistakes I missed the first time. I fixed them all and uploaded the corrected version to KDP. (Thankfully, I'm only published in one place right now, so it wasn't to hard to fix. 

I believe I will invest in an editor in the future. Anyone else make this mistake?