Hi there, I'd love to help you figure this out.
You can create custom orders in a web gallery by clicking the following:
- Go to Share Settings from the top right > Select Display > Click on 'Show Me'
- On the following page > Go to 'Reorder by' & then sort by the given options. The capture date order might work for you.
Check this article for more help: https://helpx.adobe.com/lightroom-cc/how-to/share-photos-on-web-gallery.html
Let me know if this helps,