Hey @kinwolf:
Welcome back! :smile: I've been doing some digging internally just to make sure I had the best possible answer for you. Currently, 1Password 8 does not support importing, so it sounds like you might have imported a CSV exported from KeePass into the 1Password.com web app. Additionally, it doesn't look the KeePass CSV export includes folders. However, I've just been doing some testing, and it looks like with using MrC's converter suite you should be able to get your KeePass items exported with tags.
The KeePass steps for the converter suite do require you to export your KeePass data as a KeePass XML format, rather than a CSV. Once you have used the converter, and created a .1pif file for importing, you will need to temporarily uninstall 1Password 8, and install 1Password 7 and import that, but after importing and ensuring all items are synced to your 1Password account, you can reinstall 1Password 8 and still have all your newly imported items.
Hope that helps you get all your items imported!
Jack