New user, stuck with 2 passwords

New user with >50 log ins added so far. HELP! I changed my master PW to make it stronger, saved it, reopened 1Pass after quitting it, can see the PW listed when I check...BUT, I was not able to open 1Pass with that new PW. I had to revert back to my first PW in order to open 1Pass--which is not longer listed inside of 1Pass. ???? All this on my Mac.
2. Also, I set up multiple vaults in different categories. Now I wonder is this is a mistake. Is the information in my Personal Vault more secure. I am an individual, not using a family plan. Thanks so much.

1Password Version: brand new 6/22
Extension Version: Not Provided
OS Version: Mac 12.01