It seems that Muskroot sendings are being broadcasted to all PCs, regardless of whether or not they have a totem.
I have noticed that too when I rolled a character, he did not have the totem yet and still heard the sendings.
Can confirm as well; thought perhaps it was intentional, as it only seems to work within radius of mistlocke and around the forest - or at least some times.
Confirmed, and it happened to my yet totemless PC in the zig.
Fixed.