What happened to my photos on iPhone

The Apple iOS update 18.2 has made some significant changes to system apps, especially Photos. You may feel like all your photos have moved, gone or you have multiple copies. 

Well it’s most likely due to the new interface and the new way things are grouped and sorted. If you scroll down to the bottom of your default photos app screen there is a customise and reorder option button.
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You can turn on/off collections as you like and then drag the order around using the hamburgers on the right.

Reset option is there if you lose track of what you are doing.

Checkout the utilities menu for things like duplicates.