iPhone/Google photos issue

Hi everyone,

I've had Google photos installed on my iPhone for a few years and I use it to upload photos of my children for other family members to see. I edit the photos on my iPhone/MacBook and delete duplicates etc. The updated photos then appear in the Google photos app for me to upload.

In the past few months, the photos on my iPhone have stopped communicating with the Google photos app. I can see photos I've deleted long ago in my Google photos app, which is very frustrating.

Does anyone know how to stop this happening? I basically want Google photos to mirror exactly what's on my photos/iCloud as it used to.

I have an iPhone 13 Pro and the iOS is 16.3 if that has any bearing.

Thanks in advance.