I have spent two days trying to figure out this and still I couldn't fix it. I have two lists in different sites. In list A, I used PowerApps customize forms to populate a single line text column IDTest from a UniqueName column which is in list B. Things work fine, I can see list of items from UniqueName column from list B under IDTest column in list A and I can select one. It saves the selected item normally for the first time. However, if I click that to edit the IDTest or any other column on list A, the IDTest resets to default value in combobox (basically the top value in the list coming from list B). Any help is greatily appreciated. Thanks.