Let’s take the scenario where you have a ListBox in a PowerApp that contains sorted information – either alphabetically or numerically, doesn’t matter – similar to the following:
The user selects 1, then 2, then 4, and all is good, however you may notice that sometimes the values are not sorted. You may receive the values out of order like: 4,2,1 or 2,4,1. The reason for this is that the values are in order that they are selected and not necessarily in the order that they exist in the list. For example, if the user selects 1, then 2, then 4, and then deselects 2 and selects 3, the value list will result in 1,4,3.
Hope this helps!