Brewing stands do not get unregistered

#1
So I joined the Alchemist job and placed down two stacks of brewing stands (not knowing there was a limit) and it told me I've reached the maximum amount I can place. I then broke them all and placed down five and it told me the same thing. It appears the brewing stands do not get unregistered and it would be really nice if someone could help or fix the problem! Thank you for your time