Hi, I am esperiencing some syncing issue with Galaxy.

1) If I assign a tag to a game ion website, this is not synced with Galaxy, and vice versa.

2) A few games from my Epic Games library don't show up in Galaxy (I have already tried Cog -> Sync Integrations)

Any help would be welcome :)

Hello,

1) Yes, tags are separate on the site and in GOG Galaxy. You can vote for this entry in the community wishlist:
https://www.gog.com/wishlist/galaxy/sync_tags_from_gog_store_on_website_to_galaxy_client

2) You're not the first with that problem. Epic Store is an official integration, so you can open a support ticket if the problem persists. Don't use the Report a Bug feature if you want to hear back from a support agent.