Links to layers

I have created five shapes - all named on the timeline - and I am trying to use a mouse rollover for each one to reveal the relevant slide layer for each one. Sounds all pretty straight forward. 

However when I create a trigger for shape A and link to layer A, this replicates across the other four shapes meaning that my triggers all show the same thing. For example, if I change the trigger for shape B to link to layer B, that changes trigger A from A (where it was) to now B as the latest trigger I created.

I created five shapes originally  using drag and copy and I thought that might be the issue so I subsequently deleted ALL shapes and started again - one by one.

However after creating five separate and individual shapes I am right back where I started from which is that the trigger for ALL shapes picks up the trigger of the last shape I worked on.

Oh and if I delete one trigger, I delete them all - automatically and at the same time.

Any ideas?

Bill