F-Curve selection in armature different than objects? +video prev

Hello, i run in to a strange issue in Graph editor where after selecting a single curve lets say X location and scrolling in the timeline automatically selects all the curves with doesnt happen when i do this to object not armature.https://blenderartists.org/uploads/default/original/4X/3/9/3/3931a9e52f955fc6a4f6233304a9348d0870b37d.mp4
I dont know if i turned something on by mistake or is it some sort of a bug???

so… can anyone tell if if this is a normal behavior in blender or is it just on my side ??