Every had a small banking error? How about a $2000 typo?

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I sent in a check to my credit card company through my credit union's online bill payment service. I also get emailed announcements if the balance in my checking account drops below $1000. So, I check my email and I see my balance lower than expected. I look (online again) at my bank statement. I see that I made a $6051.38 payment and that $8051.28 was removed from the checking account. Apparently, it is possible for there to be a typo. I'm not sure how this works. See, I typed.. electronically.. 6,051.35. So, in order for there to be a typo, someone at the Credit Union has to be manually re-typing numbers that I've entered. The check which was sent to the Credit Card company was for 6,051.35. The debit from my checking account was $2000 higher. So.. how do they send the right payment to the credit card company but take the wrong amount out of my account and not notice some phantom error of $2000 on their books? Well, I guess the wisdom here is to trust no one. Any similar stories from your end?