Mediating involvement happens when information flows from person A to B to C, where A and C rarely talk directly. A & C could be individuals or a group. In some cases there are multiple Bs!
Think about the telephone game where everyone sits in a circle passing a message around until it comes back to the source. It's often crazy what gets back, even with the best of intentions. Imagine having a conversation back and forth between the first and last person in the circle!
Full disclosure: I've been guilty of being a mediator, it's not about blame, it's about what we can do to avoid these issues:
In my experience:
This is very simple to mitigate. When a situation arises where involvement is needed, directly involve the responsible people in a conversation. This can't always happen immediately so keep track of these situations in an area visible to everyone so they can be addressed as soon as possible.