AP Classes and Weighted GPA

So I took 1 AP Class last year, AP Psychology, but my GPA is a 4.07 even though I got A’s both semesters? How is that possible? I thought that an AP Class would boost my GPA to a 4.1?

And this year I took APUSH and AP Language and Composition, but my GPA is a 4.1 (I have an A in both class)? Am I doing something wrong?

And do you have an advice, tips, opinions on AP Gov & Econ, AP Lit, AP Bio, or AP Stats? Which ones are worth taking?

Thanks.

How schools assign weights to classes is school-specific; ask your GC.

Oh, thank you very much!