Klines data for the same historical period keeps changing. Why?

Hi all,
I want to get klines over some 12-hours period in the past. A request looks like this:
https://api.binance.com/api/v3/klines?symbol=BTCUSDT&interval=12h&limit=1&startTime=1715886000000&endTime=1715929200000

where
startTime = GMT Thursday, May 16, 2024 7:00:00 PM
endTime = GMT Friday, May 17, 2024 7:00:00 AM

Although the time period is obviously in the past, repeating the request leads to different responses (please notice the quoteAssetVolume changing) How could it be?