Try these things first:
Ensure you have a stable internet connection. (Offline Mode: Coming Soon!)
Verify that you have completed all mandatory fields in the dive log form.
For an immediate fix, try to:
Update via App Store: Check your app store and update to the latest release.
Uninstall and reinstall the app.
If you need further assistance, please submit a Bug or Issue Report and it will be reported to our team ASAP.