Search API Along Route Search produces random results

Hi.
Search API [Along the Route] charging station search produces inconsistent results when using identical sets of POST route[‘points’] body and Params. as follows,

https://api.tomtom.com/search/2/searchAlongRoute/Electrical%20Vehicle%20Charging%20Station.json?key=APIKEY&maxDetourTime=600&connectorSet=IEC62196Type2CCS&maxPowerKW=99&minPowerKW=50&limit=20&detourOffset=true&sortBy=detourOffset&categorySet=7309

See sample results below:
Why does the searchAPI AlongRouteSearch rest-api produce random responses on identical http requests?

Can you calculate detour times for those stations that are sometimes present in the response? Are they close to 10 minutes?

Thank you.
Yes they’re close to 10mins, see screenshot below:
What does this mean?

API returns only 20 results, but there can be more, which is the case here.
Is there a reason that you expect to have every time the same result?