LVDS signal distortion w.r.t switching power supply
Scale indicates 20ns/div (1div=1cm?) and baud signal looks like 5 symbols or 2.5 square cycles in 20ns or 125MHz (clock? data? )  

Spurious resonance is 4 cycles in 20ns thus 200 MHz into 50 Ohms with a Q of ~4 to 5 thus 50 Ohms/4 = Xl=Xc(f) = 15 @200MHz thus 100pF coax capacitance and 15nH

Thus you can now calculate more accurately

Most likely probe ground leads picking up common mode current surge in low ESR cap currents from ground wire.  

Use SMA connectors or &lt;&lt;5mm probe pin &amp; gnd and GOOD coax rated for 1GHz.

my quick calculations were from in my head not using calc...

Root cause may be measurement error masking true data errors from crosstalk in PCB tracks and poor balanced impedance from poor differential controlled impedance tracks, connector , cable etc.

Get better measurements first.