Tesla app not showing correct solar (or is it)

Location - United Kingdom. We had our Powerwall 3 & Gateway 2 install late December 2024. Recently we have had a good streak of sunny days. Quite a few have been very sunny. We have ten 420W double faced panels. The Tesla app does not report any Solar more than 3.2kw. That is spookily the same as eight 420w panels. Our Powerwall installer says that they can see up to 4kw at our property on their system. Our installer also contacted Tesla U.K. support who said they would keep an eye on it. Our installer and Tesla support are now not communicating with us on this subject. Does this ring any bells? That being, the app ‘under displaying’ Solar output?