Form Ohio SD 100 printed with my State Return this year, why?

In my Ohio State Tax returns, I see new pages in my return I have never seen before in previous years.

3 Pages called OHIO SD 100.  Line 19 for amount due is blank (we owe nothing).

These new pages may be due to a question I answered wrong, but in the HELP area it said IF you see numbers in certain boxes of your W2 you likely need to answer yes.  So I did.

We do live in district, my husband is employed in same district as school as well.

My school district is

Ohio-

County is Henry

City School District is in is Napoleon.

I tried for over an hour to lookup if my city school district to see if I need to fill out the Ohio SD 100 forms. 

I don't ever remember encountering this before. Any these forms are not in any of my past returns.

I am paper filing:

1. Do I keep these forms and if so, they have their OWN area to sign on these pages as well. 

Do you also sign these separately from main return?

3. If I need them do I mail them with regular return to same address for Ohio taxes or what to do with them

I want to understand what happened so I don't ever encounter this issue again.