No matter whether there is input or not, the default value is always visible. From what I have seen, they should just disappear when a node is connected but these stay and make the entire thing very confusing to deal with.
What versions of Unity and Shader Graph are you using?
I had the same problems on alphas and betas, but none on stable releases.
Unity version is 2019.3.0a5, Shader Graph is 6.5.3 (I updated it today through the package manager and no change)
Turns out there was an update, but the package manager didn’t show it unless I opened up the ‘Show All Versions’ dropdown… Updating it again has fixed this.
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Cool, i was having the same problem here. Thanks man