Sorting problems with synced collections

I placed 50 photos into a collection and have them sorted by capture time. I synced them to Lightroom Mobile. I added 5 more photos to the collection and synced them as well. All are sorted by Capture Time. I went to "View Your Synced Collections on the Web" to create a link to send to the players parents. I have that set to sort by Capture Time. After I create the link and view from the link the 5 photos I added later are not in the correct order. This is been going on for a long time and I always work around it. Take all the photos out and then sync them again. Kind of a waste of time. Just curious if anyone knows what the real problem is. Thanks.