Why is my refund significantly lower, if nothing has changed from the previous years?

[Marketstar]

There are a number of reasons why refund could be lower, see below:

https://ttlc.intuit.com/replies/3301788

If everything is exactly the same as the previous year, you should rrevisit all of your entries for accuracy and completeness starting with your W-2. You may find a misplaced decimal or two or an extra 0.