Project merge issue - same camera merged into two instead of one

Hello, I have an issue when merging the projects. The photo in several projects were taken from the same device (Iphone 14 Pro with viDoc RTK). However, when I try to combine two project, sometimes it merged into one camera, sometimes it doesn’t. Moreover, when I tried to combine the third project, it become three cameras model instead of one.

My question is how to combine it into one? Do I need to modify the exif or do I need to do another thing?

Thank you.