Schwab (the bank in the US) started rejecting my signatures, on the basis that several documents I submitted had identical signature images. I worked around that by making a new signature, but you could imagine them escalating to also complaining about the fact it was not wet ink.
I had an application to open a new bank account rejected because my signature was not close enough to the one they had on file. I tried resolving things over the phone, but no luck. So I closed all my other accounts and switched to a different bank.
I had a similar problem once at my bank while submitting some inconsequential form but for bureaucratic reason the signature in the form had to match with what they had in the file.
As I had opened account with them years back, I couldn’t recollect what I had signed then. The clerk at the desk helpfully turned her display for me to take a quick glance at the signature in the file which I copied in the form. Thanked her well.
Several years ago my bank had to store three signatures because I couldn't (and still can't) produce two identical ones. Last year I had to update some documentation and they had to store two more signatures, so now I have 5, but any other signature will be different anyway.
The reason is likely that, as a leftie, since being a kid I had to suffer a few attempts to force me writing with the right hand, something I trained by myself much later in my 20s out of curiosity, but quickly forgot due to lack of practice. I never perfected my horrible handwriting and resorted to block capitals immediately after school; then computers and printers solved the problem. Unfortunately it seems there's no way to get rid of this archaic thing called signature that for me translates into wasting lots of time; I'd rather leave a blood sample on paper if I could:)
