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Autotransformer output voltage different

I just purchased a 100A Autotransformer, with 240V input from a generator and expecting two equal split phase outputs. Below are my readings (5v difference)

Unloaded

Generator output 235VAC

L1-N is 115VAC

L2-N is 120VAC

Loaded ~226VAC

~110

~116


I have swapped my loads on the output and no help. Also removed PE coming from generator to remove any question of N/PE bonding in the home electrical panel. I see other posts where differences were noticed but none connected to 240 on the input. I can only explain this by the center tap of the transformer is not accurately placed. Any ideas? I have started RMA process.


Autotransformer
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Can you explain why this is a problem?
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