LeadGen forms steps are dynamically adjusted in height by default. Here is how you can set a consistent height to all form steps.
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LeadGen forms can either have a dynamic height (set by default) or a static height.
When using multi-step forms, the form step height automatically adjusts based on the length of the content and questions on each form step.
To make all form steps appear with the same height, turn on the static form height setting. To set this up, open your form, and go to the Design section, Theme Settings, Form, Static Form Height.
Hit save to keep the changes. Your form height will now be set based on the height of the longest form step.