Hey
Any Input Field that you have setup in that fields settings as required will be red when you open it. That color of red is a UI Design thing and you can change that in the design of the field under ERROR settings.
But when you set a field as required it will require the user to enter the type of text / value that correspond to the field. Maybe you have copied fields on your page and some field still has type = number or phone number but it is a text field in the data collection and therefore you will get an error.
Double check all fields.
In the video it seems that you go from page to page with different information and if you don’t SAVE between pages and hit the Backward button in the browser the storage won’t work for the entered data.
I would suggest you add your form elements into a slider instead and just use next and previous in the slider to navigate between the different information areas. Then you are on the same page and can use the same dataset on all forms.