Lastupdate Wrong value

Hi,
I have installed teltonika FMB with traccar server and it has more than 8 days without internet the problem is in the lastupdate attribute it shows that it has only 5 hour from the lastupdate and in the position it shows that it has 8 days from last position
Best regards

If last update is 5 hours ago, it means that device with this id sent something 5 hours ago.

Hi,
it has no internet!
how do i know what did sent?