Yip. Been there, experienced that.
One time (thankfully just once) the bank scanner read a check made out in type for $800 as $300 probably due to some imperfection in the type. The written line (in type) read correctly however. When I saw a deposit for $300 on the bank statement I knew it was wrong. Went to the bank, had them pull up the photocopy they had saved and was able to show them the true amount was the full $800. That threw them into a tizzy as they had no knowledge that the “system” could make such an error. Not sure how they handled this with the entity who had issued the check to me. Perhaps they only got dinged for the $300 and never realized how lucky they were.
Never assume others care as much about your money as you do. Mistakes can occur for some of the most unexplainable reasons. About 2003 my daughter was a starving college student. She was still banking at a hometown bank even though she was nearly 200 miles away. She had a debit card from them that was readily accepted. A few days prior to Christmas she finally got around to buying Christmas presents, using the debit card. Suddenly, it was refused because it indicated she was out of money. Being quite frugal, she knew exactly how much was in there at all times. She should have had several hundred dollars left. Instead it said she was over by some small amount before it cut her off. She called the bank. They got with there debit card provider and then discovered every use of a debit card issued from that bank had been hit twice as of a certain date. A $20 dollar purchase would show up as a $20 debt followed by an identical $20 debt. The vendor was actually receiving the full $40. My daughter was one of many who had been affected, but the first to notify the bank that something had to be wrong.