All cool, I still have people on the old pool a day and a half later - some DNS caches just last forever, even though the time to live is set to 5 minutes so maybe that's what you're experiencing with solo6. The other addresses were always available, they've just been pointed to the new pool, but perhaps they were hard to read on the old page. Higher hashrate is almost certainly just an unusually lucky streak as there's no valid reason the pool would give a higher hashrate, though lasting 10 hours is odd. The link I"ll update.

Anyone still on the old pool address - either because of DNS caching or because they're mining directly to the IP instead - their shares are being forwarded to the new pool.

Keep hashing, and onwards to our next block!