yes, it does happen.
few years back i had a positive balance in an account, went to the bank to tell them, their response was we don't make mistakes. Okay.
Money sat there for about six months, till i said the heck with it. If you don't want to correct the error in your favor, so be it.
It use to be you had humans with a machine inputing a magnetic code on the bottom of the check off the numeric and written amount. I am sure computers do that now. And they can make mistakes by not reading it properly.
I always look at the code at the bottom to compare to the written amount in case of an issue.
