The new lead scoring does not prevent the same form submission being scored multiple times.
For example:
If you have form A set for 50 points and form B set to 50 points and a contact filled out both forms, then they will have 100 points, but if they fill out form A again then they will have 150 points.
I understand that this could be seen as useful in some scenarios however in the majority of cases especially for content lead forms we would only wish to score the form once.