Single channel hierarchical design error

[blueskull]

I have implemented a hierarchical design with one parent sheet and 4 child sheets. Among the 3 child sheets, one gets instantialized 5 times, while the other 3 only get instantialized 1 time each, which makes them essentially single channel design.
When I try to compile the project, the 3 single channel designs won't auto rename part names and nets, which lead to errors.
So my question is, is there anyway to force single instantialized sheets to auto rename?

[T3sl4co1l]

What's under Project Options / Multichannel?

Tim