shim
It looks like someone shimmied the nut from that first pic and not how we make things here. The Nut should be seated all the way down to the wood. Possibly he last player had a heavy touch and wanted the strings higher so it got shimmed somehow.
Without having the bass here in my hands or on my bench, I cant say for sure what needs to be done. I, personally do not use measurements in the set-up. Only feel.
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