Late arriving data fromDateTime

I’m sending a request to v2/calls/extensive? and trying to fetch data for the previous UTC hour.

Request body:

{'filter': {'fromDateTime': '2024-09-23T19:58:59Z', 'toDateTime': '2024-09-23T20:59:02Z'}}

I’m receiving some records, but when I rerun the same request later, I get many more additional records.

What could be the reason for this behavior, and is there a way to fix it?