Missing data on server, all submissions sent

1. What is the problem? Be very detailed.

About 1% of records are not reflecting on the server. Various phones used and checked to ensure submissions were sent.

2. What app or server are you using and on what device and operating system? Include version numbers.

Server: https://.odk.ona.io
Devices: various
ODK version: v2021.2.4 and the previous version 1.8

3. What you have you tried to fix the problem?

We checked all phones and confirmed submissions.

4. What steps can we take to reproduce the problem?

Not sure, we have about 600 submissions a day with photos

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.

This sounds like an issue with the Ona server, so please contact them for help at https://help.ona.io/.