Question for the Benchmark scores

Hi guys,
I just run the Benchmark for my Desktop and my Laptop and was wondering about the numbers.

First: I was running ARR on Maximum Settings for both until now without trouble (besides some rare lag Spikes).

My Desktop:
Windows 8.1
Intel R i5 3350P CPU 3,1GHZ (4 core)
Nvidia GE-Force GTX660 (VRAM 1476MB)

Benchmarkruns:
1. 42xx (Maximum with a few changed Settings (xx because I'M not sure anymore how high exactly but between 4,2k and 4,3k)

2. 4832 (High)

3. 5408 (Medium)

Now it gets weird, i wanted to check Maximum with standart Settings:

4. 1963 (Maximum)

5. 2677 (Maximum full Screen instead of window)

6. 2148 (high)

7. 4364 (medium)

8: runned at Maximum with full Screen and looped)
8.1: 2199
8.2:1555
8.3:1524
8.4:1523
8.5:1487
8.6:1454


Laptop:
Windows 8.1
Intel R i5 4210H CPU 2,9GHZ (4 core)
Nvidia GTX 860M (VRAM 1972MB)

First run was on Maximum and was in loading Screen for an extremly Long time and then had rhoughly 1FPS so i stopped that one

2. 885 (high)

3. 1193 (Medium)

Loop didn't measure the score because of to low fps



Now my Question:
How can it be that for my Desktop the score differs so much and that the score for my Laptop is so low while performing well for the game normaly?

Am I doing something wrong with this Benchmark?

Thanks for your answers and taking the time reading all this.