it may actually have just been you moving it. bud blast can happen
with a change of temp, or other conditions, or just cuz the plant feels
like it. i've got a couple young 'uns that blast a bud or two before
opening the rest; i have an old den that blasts a bud on each spike just
out of cussedness.

next year leave it where it is until the flowers open, then move it to
where you'd like to look at it for a while.

--j_a