prolongation of the legs ruins the results

[antenna_beginner]

Hello, i have built a simple coupler which i need to connect to other couplers, but when i extended the legs of the ports I get a drastics change in the results,as shown in the attached photos bellow.
Why it happens, in physics point of view the width of the line changes the port , i have not changed the width only prolonged the length.
what needs to be done to safely connect several componnets?(which the sam copper material)

Thanks

 

[FvM]

An obvious conclusion from the results is that the "legs" don't are 50 ohms impedance lines, as presumed by the design.

 

[antenna_beginner]

hello the main problem is that my S11 S22 S33 S44 are noot equal ,although my dimentions are equals

is the a way to see where is the problem?

Thanks

 

[FvM]

Would you mind to show all designed line impedances and lengths?