A more detailed description may be better perhaps. If I hadnt missed it, there is no implication for "we only need to shift letters", "the shifted characters also should be letters" and "If they are capital so should the shifted ones". But really fun kata LOVE IT !!

If you take N and come back S same way back then E and come back W same way, you'll finish at the same point. But if you go N=6, W=8, S=3, E=1 you'll end not in 0,0 (start point) but at 3,7.
Imagine labirynth, where corridors aren't the same length.

The same as it was, minus the reduced directions.

If the path is important, order matters.

Please, improve task description. What should be the order of strings in returned array?

This is expected behavior coming from random tests. Your solution has some bug which causes only some type of inputs to fail. see this for some details: https://docs.codewars.com/training/troubleshooting#works-but-no and this on how to debug your solution: https://docs.codewars.com/training/troubleshooting#print-input

Its most probably not a kata issue, but if you can confirm its a kata bug, feel free to reraise it with further details.

Looks like some issues are there with the instruction / test cases.
For the same code the number of test case pass/fail is different .
Recorded the screen, check the video https://streamable.com/qf2yn9 (P.S. The code is not visible in the video)

Please see if this helps: https://docs.codewars.com/training/troubleshooting#works-but-no

I dont understand, in every try I fail a random test but pass like 50 of them. Any solution ideas ?

Tip: I would use ASCII values