Sounds like a code problem. Closing.

@jebisata ..

• Thanks Bro for your Comment also naming the language is a nice touch helping a lot in healing the issue
• I Think another solver had posted nearly the same issue down below , and it was his Code problem as it has been completed 60 Times Without PowerShell issue , So Could you please Trace your Code and I'm tuned to hear your feedback
• Hope you've Enjoyed Maximum Triplet Sum .. Regards .. Zizou

There is something wrong with Powershell...

should return 18 when input is 1705
Test Passed
Completed in 429ms
should return 19 when input is 1900
Test Passed
Completed in 59ms
should return 17 when input is 1601
Test Passed
Completed in 22ms
should return 20 when input is 2000
Test Passed
Completed in 14ms
should pass random tests
Expected: {1800}
But was: {1801}