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The impedance mismatches in coaxial cables, theoretically appears only if the coaxial cable is too long or is improperly terminated.

In our case, when using 50 ohms resistors placed in parallel to the input and to the output, the RG58 coax cable is improperly terminated which cause reflections.

We are doing simulations using ideal coaxial cables. In reality, coaxial cable impedance is more dependent by its length due to cable imperfections. RG58 is a cheap cable, and is not keeping well its impedance vs length. For example an LMR-200 coax cable behaves totally different when is about multiples of wavelength.