analogous mechanical electrical system- LTSPICE
The resistance values you are using are extremely low in one case and extremely low in the other. Most simulators assume the resistances are in the range 1 milli-ohm to 1-gigohm. The simplest solution is to rescale your analogue (usually by a factor of 1000) , e.g by making kN = amps or mm/sec = volt,  You want to get the resistance of 260.8uΩ to change to 260.8mΩ and R=1/0.0002608 to change to R=1/0.2608.
With resonant circuits, what is most important is the &quot;Q&quot; of the circuit, which is simply the ratio of reactive impedance to resistance , which is also the ratio of mass to damping.
The other way to fix this is to get into the simulator settings, then change  things like &quot;minimum current step&quot; or &quot;minimum time step&quot;  or &quot;minimum error&quot; or &quot;minimum resistance&quot;, the instructions for your simulator will tell you what to try. (I haven't used LTspice for decades, so can't tell you the particulars)