Wrong maintenance loan amount given?

Hi I received my entitlement letter last week and it says I was awarded £3650. This was much lower than I expected (I am in my final year so I expected it to be lower but not this much lower) and is barely above the minimum amount given. For reference I was awarded £4259 last year so this is a massive difference in amount. There is also no difference in my household income, so I didn’t expect such a big decrease in amount for my final year.
Since the amount was so low I originally thought I accidentally applied for the non-mean tested loan, so I went to change my application and it says there that I have already applied for the maximum amount and I was already awarded £4453.
I spoke to an officer on the live chat on the SFE website about this as I originally thought I was awarded the non-means tested amount as I previously said. They basically told me that I should just refer to my entitlement letter as this is the correct amount and I got so little because I am in my final year (and that the final year mimum amount for living at home is £3482).
But I am still wondering why there’s a big difference in the amount being shown that I should be awarded on the application page vs my entitlement letter. Is is possible that the amount on my entitlement letter is wrong?