As you can see here to calculators I found show huge difference or didn't I set it up correctly? I didn't found hints on possible validity limits. Can someone say if one of those given out results is correct? I mean a mismatch of 18 ohm is a no go... Both freeware, is there a commercial software with higher quality?
Edit: Added image with changed material, no significant change, as to my knowledge only the dielectric constant is important, which was set to same value in first 2 pictures. Am I missing something?