I've found this same bug.

If I have strobe on one toon, any of them.
And later switch to another toon.
If strobe is on (for example, melee toon so they will automatically re-follow after combat).
And I get into combat.
All the toons start to follow the first toon which I had strobe followed.




Let's say its a collection quest.
I usually loot everything on A, then everything on B, until done.

And its a mixed team, with both melee and caster toons.
So I have Strobe on, but pause during combat.

Everyone is strobe-following A, who is the master.
Once A has finished collecting, I switch to B.

B is the master now.
And I do the same thing as with A.
Except if Strobe is on, and I enter combat, everyone stops following B and starts to follow A.
Even though B is the master, and follow or strobe follow was fine on B, outside of combat.

The only way to have strobe follow B, while in combat, is to log out to character screen.
And then log back in.
With B as the "initial" strobe target for the session.
And then do the same with C and D etc.

The work around, is to manually turn on follow after each combat.
But that defeats the purpose of Strobe.