slideshow

Hello mattou,

It sounds as though you're exporting a slideshow from the Photos app on your Mac, but the photos are appearing in the wrong order. Apple Support Communities is a great place for help!

To confirm, are you following the steps outlined in the "Export slideshows" section of the following article? If so, are you experiencing this issue when exporting multiple slideshows or one specific slideshow?

Export photos, videos, slideshows, and memories from Photos on Mac

If the issue is specific to one slideshow, create a new slideshow to see if the same issue occurs. If needed, the steps for creating a new slideshow can be found in the following article.

Create slideshows in Photos on Mac

Let us know how that goes!

As a test launch Photos with the Option key held down and create a new, test library.  Import some photos and test to see if the same problem persists. Does it? This tells us if the problem is limited to your current library or is more wide spread.

If the problem doesn't exist in the new library open your current library and export again.