One user reported a similar-sounding issue with links on the guild.

I have two guesses:

1. Opera is remembering the old state of the guild (how it was a day or two ago) that's been since fixed, but it's trying to redirect you to HTTPS.
2. You have Opera's Turbo Mode turned on which is causing an issue.

Can you verify that you're still having an issue with the links?

If so, can you tell me if you have Opera's "Turbo Mode" turned on or off?