Tracking station always displays the trajectory of the last selected target vessel

[scimas]

If you target a vessel and then go back to tracking station (directly or from space centre, doesn't matter,) the trajectory of that vessel is always shown in addition to the currently selected vessel. Save file attached.
track_stn_bug.zip

The target vessel in the image is Grewack or someone's wreckage in high Mun orbit.
KSP 1.3.1
Principia Chasles, FAR, x-Science, KAC, KER, Transfer Window Planner

[scimas]

Happens with the 陈景润 release too. A slight clarification would be you have to select at least one vessel in the tracking station before KSP starts showing the trajectory of the last targeted vessel too. It won't plot its trajectory if you just explore the celestials in tracking station.