It appears that the command /d is used by both VoxelSniper and VentureChat.
VentureChat's usage of it appears to dominate. In VentureChat, the command sets your channel to the donor channel. This is rather redundant because /ch d and /ch donor also do the exact same thing.
The simplest solution would be to disable /d in VentureChat and just let VoxelSniper use it.