State Bank Of India [SBI] — Part period interest

Address:

Jubilee hills Hyderabad

I had taken 700000 Rupees loan. Loan Issue date was 5th Jan 2023. But at the end of Jan month on 31st a Part Period Interest is debited from my account of Rupees 4375. What it means and why it is debited in my account at the end of month. They did not tell us anything prior ..