The ability for the browser/computer to remember the Passphrase is both helpful and a curse because many of us forget the Passphrases since the browser/computer does all the work.
Luckily you can get your browser to reveal the Passphrase rather then change it. Just do a Google search for "<browser name> Saved Passphrases" where <browser name> is the name of the browser you are using to log into Moodle. This will give you detailed instructions on how to reveal the saved Passphrases.
Once you find the Passphrase list, look for the Passphrase associated with your username. If there are different Passphrases, write them all down.
Once you have written them all down, go to Moodle - https://moodle.royalroads.ca/moodle and enter each Passphrase in manually till you find the one that works. (Please note that if your browser asks you if you want to save the Passphrase, do not hit yes, so you don’t accidentally overwrite the good Passphrase with a bad one.)