Well, again: that's odd.
Try torun ./nodebb dev, visit the ACP and deactivate both soundcloud plugins restart nodeBB (click the little popup in upper right corner, after disabling plugins) wait for nodeBB to be up again enable only one of the soundcloud plugins.
If that still doesn't do the trick, you might want to update all plugins with the "update" button in the ACP. You have a lot warnings, regarding outdated plugins. If that again does nothing, my last two cents would be to deactivate those outdated plugins to see if they cause any trouble.