I’m not quite sure what happened to your other post either, but it isn’t showing as a duplicate.
I think that this will be down to what is actually stored as the extension fare from Windsor to boundary of zone 3. This is one aspect of the PAYG system that is sadly lacking, as it isn’t publicly available. The intention will be to charge a Windsor to zone 1-6 travelcard which is £22.30 off-peak. That will be GWR’s decision, which they will have programmed to override the normal TfL calculation. You’ll need to contact GWR, attach your journey history and explain how you think it should be calculated and ask them why it isn’t.