Bug to link portals

I do not know if this is playing Minecraft Technician, but I use portals as a means of transport faster to go from a certain point to another.

The problem is that since several versions ago that certain portals directed me to another site that I already have linked, for example in my house I have a portal and more than 1000 blocks I have another portal where I have a farm of Zombies, and these portals have linked their respective portals in the Underworld / Nether, to put me in the portal of the farm: it sends me to the portal of the underworld but which is linked to my house, and if I enter it, it sends me home ... .. another problem is that if a portal is Bug and I destroy it I always appear there regardless of whether there is a portal and it is not generated.