Hello @Andrés Halliday Martínez,
Thank you for posting your query on Microsoft Q&A.
Based on your issue description, I understand that you have added many user inputs to other steps and it worked fine, but you haven't been able to do the same with the login. You tried setting three output claims and three display claims but it always shows only two inputs, sometimes kind of mixing them.
Please note that the maximum requests consumed for Self-asserted technical profile and Display Control is 2. I am attaching the Screenshot below for your reference.
Please refer to the below document for your reference.
UserInputType:
Azure AD B2C supports a variety of user input types, such as a textbox, password, and dropdown list that can be used when manually entering claim data for the claim type. You must specify the UserInputType when you collect information from the user by using a self-asserted technical profile and display controls.
Please note that the claims what you have configured for TextBox UserInputType and Password UserInputType is correct as per the below document.
https://learn.microsoft.com/en-us/azure/active-directory-b2c/claimsschema#userinputtype
But unfortunately, it will show only two User Inputs at the same time in the Azure AD B2C login screen.
I hope this above information provided is helpful. Please feel free to reach out if you have any further questions.
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Thanks and Regards,
Sanoop Mohan