Problems with myopenhab and graphs

Hi there, I’m using a Raspberry Pi 3 B+ with an updated version of openhabian and I’m experiencing some issues.

First of all is quite a complex situation because I’m behind a LTE router with a mobile connection, I used myopenhab to reach the Pi but sometimes I got Errors (500, 502, 504), in addiction to that I can’t delete items via PaperUI and graphs don’t show in Habpanel, I tried to see via REST API and it says “error authorizing query: openhab not authorized to execute statement”

Any help is absolutely appreciated, thanks!