No one here would know that answer. You can ask the person that prepared your return. When you file as Married Filing Separately you are not able to claim some credits. If you are legally married you cannot file as Single, the usually best filing for married is to file Jointly (both must agree).
https://ttlc.intuit.com/community/married/help/is-it-better-for-a-married-couple-to-file-jointly-or-...
When you file separately, your tax rate is higher and you won't be able to claim:
