First of all, thank you for this amazing mod - it really makes building bases more realistic. Now, I have found an interesting problem with docking nodes.
I guess KIS might be involved, as I performed a number of complex EVA constructions prior the issue. I am not yet sure and still try to replicate the issue with either my 80+ mods or a vanilla+KIS only installation. I am also not sure if this problem has never occured before but my searches turned up nothing yet - so forgive me if it was already mentioned somewhere. I use KSP 1.1.2 with KIS v1.2.9.
I have two unus