CTV what you are noticing visually, but not sonically, is the subsonic behavior of the system, stuff that is happening below the lower limit of audibility around 20Hz.
There is nothing much of musical interest down there and LPs deliberately have very little musical energy below 40Hz, the lowest string on a bass.
LP playback has a resonance in this subsonic region due to the combined behavior of the stylus suspension (a spring) and the arm mass (a weight) and as weights on springs tend to do they bounce, the bounce frequency is around 10Hz on a well tuned system that has cartridge compliance and arm mass matched to one another. The warps and eccentricity of the disc occur below this resonance frequency and cannot be heard, nevertheless these very low frequency signals are present in the preamp output (unless a filter is used to remove them) and are often also present at the output of the power amplifier and can be larger in size than the wanted musical energy.
This can cause distress to the woofers of some speaker systems, when this occurs and the woofers are visible the cones can be seen fluttering sometimes called woofer flapping. This is not good for the woofers and may have an effect on musical sounds higher up in the audio band, a form of interference that may be heard as distortion.
The point is that what you are seeing is real and can reach the speakers. We don't hear 2Hz, but we can hear the distress of the loudspeaker that is attempting to reproduce 2Hz and being pushed into distortion while doing so.
When this kind of trouble occurs and the resonance has been fine tuned to 10Hz then it may be time to experiment with a high pass filter in the preamp (also known as a rumble filter because it can reduce the noise of low quality platter bearings) they can be found on some preamp units.
Technics SL1600mk2, Ortofon VMS30, modified TEAC AH500 as a preamp, Bryston 4B ST amp, Harbeth M40 speakers, all making musical magic :-)