That's because the data in those columns is not a single value, but rather a collection of objects – e.g., more than one Proxy Address. CSV isn't designed to handle that kind of hierarchy – they're 'flat file' format.
You could potentially rig something, depending on what you want those multiple-value columns to look like, but it won't be a simple Export-CSV anymore. You're just asking more from CSV than it's designed to deliver :(.
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