I have configured a web map that inspectors use to collect data on a Hosted Feature Service through ArcGIS Collector (Classic), generally in offline mode but not always. There is a point layer with related tables, two of which are the forms that are used to collect data and photos. The app has been working fine up until recently. The inspectors are reporting that photos are getting mixed-up, the wrong photos are appearing in a point's related table. The photos are being added from the photo libraries on their phones, and sometimes they will have the same name, e.g. "Photo4". The photos also come through sometimes as JPEG and others are PNG.
Has anyone else encountered problems with photo attachments being incorrectly linked? As the team continues to provide more instances of this occurring, it may be easier to drill down to the root cause, or it may just be a bug in ArcGIS Collector (Classic). Any advice is appreciated.