How is the Footer3 field padding-left or margin-left code?
All three footer columns have the same width. Since their content is different, they have different spacing which is pretty normal.
If you want to change the padding of the 3rd footer column, use this CSS
#sidebar-footer .sidebar-column:nth-of-type(3) {
padding-left: 15px;
}
Please keep in mind that changing the padding is causing the width to be reduced what can have an impact on its content.
The components do not have the footer 4 field.
What do you mean with this? Do you have the footer settings in the Customizer set to 4 columns? Do you have any content in the 4th column inside of wp-admin > widgets?