How are people getting more than 5 redeemed souls per week?

My friend has acquired 16 redeemed souls so far in the first 2 weeks of Shadowlands. I have only gotten 10, via the weekly quests. How is it possible to gain extras? he doesn't know where his came from either. On tuesday, he had 1 extra, which allowed for a tier 2 upgrade right away. Now he has another 5 extra.

We can't find anything on this other than the 5/week quest rewards. Anyone seen something like this?