You are also counting a majority wrong. When the exit poll came out, they said “a majority of 86.” That was on 368. You have to understand what that means in a Westminster system.
It’s not simply how many seats above 326 that a party has.
A quick way of working this out is to take away 325 from the number of seats that winning party has got and double the result. For example: 350-325=25*2 = Majority of 50.
A 363 seat win would be as follows: 363-325=38*2 = a Majority of 76.
Not real intuitive, but I see how it’s done - for every seat gained, another has to be lost as the total number of seats has to remain the same.