Matti Haveri said, "Apparently the photos do not have internal metadata dates"
Based on the convoluted way you got the pictures to Photos, that's likely the problem.
But I imagine another possibility, just in case: Where do you see these pictures all together? Is it in the Recents view? Those places called Library and Recents, etc, are not real albums--not like the ones you make yourself. These are special pre-set ways to view your pictures. The "Recents" view shows all the pictures in your Library in the order they were added to the Library-- not necessarily in the order they were taken. If a bunch of pictures are added at the same time, then they show up in a random order.
The "LIbrary" view shows all the pictures in your Library in the order your pictures were taken. This can't be changed. These albums always provide the same view so that, when something goes wrong or seems off, you (and we) can depend on them always showing the same thing, and there's no chance that someone snuck in and changed the order or removed pictures.
If you put your pictures into an album that you make ( in the Photos, select your picture and then do File>New Album with Selection,) then you can put them in order by creation date-- if that is included in the metadata.