Board Thread:General Discussion/@comment-33149505-20180504131416/@comment-32271305-20180504133255

There's a 98.5% chance to pull an SSR with 40 singles, so you just got really unlucky, it happens to everyone from time to time.

And as Gilaad said, every multi-summon is now GSSR on JP. The summon rate for featured SSRs is still the same, so in most cases you'll get a non-featured SSR, but it's still better than getting an R or an SR.