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Why do i get different values for total heat gain energy or heat loss energy for different window to wall ratio values but for the same building geometry

I calculated WWR using different approaches which gave me different values for WWR.

The zone heating values oor heat gain and heat loss are around 1.210^8 J for WWR ~ 9 % but 3.510^8 J for WWR ~35 %. How can there be different heat data and graphs for the same weather and same building gemometry.

Why do i get different values for total heat gain energy or heat loss energy for different window to wall ratio values but for the same building geometry

I calculated WWR using different approaches which gave me different values for WWR.

The zone heating values oor heat gain and heat loss are around 1.210^8 J for WWR ~ 9 % but 3.510^8 J for WWR ~35 %. How can there be different heat data and graphs for the same weather and same building gemometry.