When they cut the bamboo, some places put wax over it to seal off that end. It sounds like your bamboo may be rotting under the wax cover.

Does the whole plant smell when you water it, or just the tip?

its the whole plant but i fixed that i over watered it. its still alive but whats the purpose of the wax tip?

To seal it. It keeps the plant from loosing moisture and nutrients from the cut and also keeps fungus and insects from attacking it at the wound.

Its a living thing. Just like if you got a cut you would put something over it.

To seal it. It keeps the plant from loosing moisture and nutrients from the cut and also keeps fungus and insects from attacking it at the wound.

Its a living thing. Just like if you got a cut you would put something over it.

okay, thanks for the help