Your pHAT does not appear soldered at all, how is it kept in place? Granted that is unlikely the problem, it is surprising it even works at all.
Anyhow, the problem the screenshot you posted typically results from a bridge of the IC itself, which would be the one marked ‘0x63’ in this instance.
We do test for issues like these as part of the QA, but it is quite possible that you created the bridge when soldering the LTP305 just below it. Can you post a pic of the underside?
… either way, to be honest, it’s quite a precision job i.e difficult to un-bridge an IC so you may have to drop an email to email@example.com and see what potential help we could offer.
(Note: the product referred to in the OP was a different one… so moved to this topic to avoid confusion!)