I understand the layers likely have nothing to do with it.
The problem is the original Tom1 channel is getting signal, despite being unassigned and no signal coming through the HH at all. This is not about sound bleeding from one mic to another. It’s something to do with that original channel.
After copying the channel to a new strip with a different Input (same Source) it’s as it should be. Clean.
But the original channel continues to have signal.