Like i said this is usually caused by using unstable strains and genetics. ALOT of cannabis strains do some funky shit. When people inbreed for years upon years, you get a mutant. Its no different in the plant world. There is some werid shit out there man, look at this strain for proof.Barney's - Seeds



and its not tmv. As i said before TMV only infects plants in the nightshade family.