transient analysis not matching ac analysis for RLC circuit
The envelope modulation indicates and error on the input frequency with T =3us
While the spectrum indicates a bandwidth of around 100 KHz.
Try a 1ms/MHz sweep around resonance.
Simulator Alias error on display is my guess. but works on Falstad
However, your filter shape is non-std. and there are no specs.


Other comments:
Is the 0.1pF accurate or a roundup truncated?
The initial ripple envelope is due to the high Q response from the step amplitude on the carrier at startup and not the actual sweep response, so the high Q boosts the initial amplitude from step amplitude broadband energy superimposed on the carrier.
Did you really intend to have a notch?  This is the classic series-parallel C//RLC//C  xtal or ceramic resonator type response albeit not same results.
It is better to define the filter specs first.