Problem with answer

Hi people, i am experiencing an issue.

I am working with a Mikrotik gateway that forward the packages to a Chirpstack server hosted on a wan server. The ping from the gateway to the server is like 250ms.

The problem is we get the gateway discovered, and the devices start to work, and after a while they stuck, they didn’t sleep waiting for the ack.

is it possible the problem is my wan server and the 250ms?