Why would the roof of my mouth be sore (palate area) ?

Sore palate: There are many reasons the palate could be sore such getting burned by hot food, trauma from hard food like torilla chips, dry mouth, electrolyte imbalance etc. See: https://www.healthline.com/health/roof-of-mouth-swollen#your-doctor

Sore palate: Hot food burn, scratch or bruise, allergies, chemical burn, neoplasm, infection (viral/bacterial/fungal), and a whole list of oral lesions that can crop up. See your Dentist for an exam.