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So I've submitted quite a few applications so far. I realized the I've been writing the GPA that appears on my school's transcript under the School section of the applications.

However... This is not the same as my LSAC degree summary GPA. It's only slightly different, but it is different.

Am I doing this wrong? What GPA should I be writing?

For instance...

The if the GPA on my school transcript is 3.6x
The GPA in my academic summary report under "Degree Summary GPA" is 3.6y
And the GPA in my academic summary report under "Cumulative GPA" is 3.6z

Which one should I personally by typing in under the school in my application?

Since it goes under the school, just put whatever the school says it is. The law school ad comms will also get your LSAC report (and transcripts) and will see your cumulative GPA.