yup, the stems are too weak to hold the weight of the bud. tie them up or use stakes to steady them. lots of MJ strains are heavy with bud and bend over, especially "big bud". but you can also strenghthen your stems by having an oscillating fan blowing on them constant.acts like the wind in nature. this isn`t a real big problem, not even really a problem. heavy big buds are what we all want to see!
good luck man:stoned: :lama: :stoned: