You enabled master password re-prompt for an item in your vault. You can disable this by disabling master password re-prompt in the edit page of the item.
For more info, please read this page Vault Items | Bitwarden Help & Support
I turned it on to provide additional protection for financial accounts when bitwarden is open, but if he sees that I just opened it, he asks for the password again, even though I just opened it
You are not opening the item when you click on it. You are requesting bitwarden to automatically fill the password on a website.
To view the item, you will need to press the view button.
image of view button