random number of changelog items in get supplier invoices changes events

It seems this endpoint https://app.pennylane.com/api/external/v2/changelogs/supplier_invoices returns a non deterministic number of items between each call.

I'm asking for the events in the last 24 hours and I'm pretty sure I shouldn't get jumps by plus or minus 600 events between 2 calls separated by less than 5 minutes for one company token.

Can somebody on the back-end check that and revert back to me?