I created a membership account and now every entry I have ever put into password is showing double.

Hi there @MishaPF

The likely issue behind this is that you still have your old standalone "Primary" vault still on your device. That Primary vault is your old vault that you used to use prior to using a 1Password membership. The migration process doesn't so much move your data as it does copy it to the new membership vault. So what you have now are two vaults both with the same data in them. The final step of the migration process is to delete that old Primary vault.

Open 1Password and, in the top menu bar, click Vault>Switch to Vault>Primary and then Vault>Delete Vault. That should take care of the duplicates issue.

@MishaPF

You are removing that "Primary" vault from your 1Password application, yes. The actual encrypted data itself will remain on iCloud until you choose to remove it. So if anything were to happen and you needed to restore it, it would still be there.