If nothing changed for me from 2017 to 2018 why is my return so dramatically different in 2018 can I reprocess my return same as previous year?

Without looking at your return it is impossible to know why.

These are the most common things that effect your refund or balance due:

• Change in Filing Status;
• Change in dependents claimed;
• No longer have a child, under age 17, to claim the Child Tax Credit
• The amount of federal and/or state withholding;
• Income based credits, such as the Earned Income credit;
• Tax bracket changes

Here is a TurboTax Help Article that will give you more information.

For the 2018 tax year, a great deal of the tax rules were rewritten.  No more exemptions, different standard deductions, etc.  Your return in 2018 will look and probably be quite different from 2017 tax year.