IMac lock screen password not working

I know my Apple ID & Password and they both work for every purpose on my iMac except the lock screen. If I swipe my mouse in a certain way (and I'm not exactly sure which mouse gesture it is) but it locks my screen and demands a password be entered to unlock it. However, it doesn't accept my normal Apple password, the same password I use to install things or for purchases etc. I have to do a hard reboot and it logs on as normal. Any idea why?

I only know of one password I've ever used on this Mac. I've also tried 2 other passwords that I sometimes use for other things to no avail. Are there any set rules for the password format for the lock screen? If it has some very specific rules I might have adapted my password slightly and then forgotten it!

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