AVL data Delay OR missinf

Hello !
I am having multiple FMM13A devices. I attached two servers as mentioned in the teltonika configuration. But i had found data missing when i am comparing the primary and secondary server AVL records and time. Due to this missing data i am not able to maintain journey replay.

At one server i had found the updated time (new record) and at the other server i wont found the updated(new record) and at this time the ignition has stopped or other event happened.

Hello. I am waiting for the response of my above question.