Why are taxes changed to Tax Exclusive after the Purchase Order was sent?

Why are taxes changed to Tax Exclusive after the Purchase Order was sent?

When a Purchase Order is created in Xero, the tax setting will be automatically changed to "Tax Exclusive" and Xero will recalculate prices by default.
  
This is done by Xero and we can't fix it on our side.
It can be changed in Xero though, please see:
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