Party vs Solo Loot Drop Rate

Anecdotal, but it seems that either party loot is overtuned or solo loot is undertuned -- specifically in endgame.

For context, I'm lvl 80 and have been running lvl 9/10/11 waystones. I have a decent bit of +rarity drop stats both on items and atlas.

Today I ran roughly 10 level 1 waystones with a friend who just entered endgame. Minimal mods on the waystones.

Oranges/exalts/decent orbs were dropping nonstop, in some instances dropping 3 exalts per one single lvl 1 waystone.

Meanwhile running solo, I'd be lucky to see one exalted orb per a lvl 9+ yellow waystone.

Something just seems a bit off. Just me?