Hello,
Can you please try searching for "gps" on the Event type search bar :
(Click here for Image)
You can also try clearing your browser's cache or use private/incognito mode to access your device's WebUI, as it may be a cache issue.
If the GPS option doesn't show, please reboot your device and try again.
Here you can find more information about Event reporting for RUT956: https://wiki.teltonika-networks.com/view/RUT956_Events_Reporting
If the issue persists, I would like you to send me a troubleshoot file. Please, try to reproduce the issue, then access the router's WebUI, go to System => Administration => Troubleshoot section, and download the troubleshoot file from there.
Best regards,
Ismail