Buildcraft Pipes & Condenser Bug [Need Help]

[Mr_Cony]

I will be a server owner soon and have found a bug that I do not know how to fix. When build craft pipes (cobblestone pipes, stone pipes, etc.) are attatched to a condenser the block seems to become there but not there and when placed onto of each other they don't stack as normal. When something is placed in the top left slot it is unlimited EMC. How do I fix this? I would put pictures up but i don't know how to do that.