Visual logger. Location. What does a Red arrow & a sphere mean?

When I log actor location by the Visual Logger, a red arrow and a sphere represents this location in the viewport window. But sometimes (e.g. when actor is moving) positions of theese arrow & sphere does not match. What is the meaning of theese sphere & red arrow? Why their positions does not match sometimes?

It looks like the arrow represents the previous position of the sphere, BUT! sometimes (when actor moves fast) the trajectories of arrow and sphere (the path from one point to the next) do not match and are something similar to parallel lines.

Please, write at least some ideas, about how I can try to solve the problem of elimination this obcurity about what this **** red arrow IS.
Thanks a lot!
It’s very necessary for me.