The first sacrifice you did included multiple Fear of the Dark Eddies (all 5 star) and a bunch of other characters (mix of 5 stars, 4 stars, and a 3 star), which resulted in 13 Rare Gun/Assassin Souls (3 for the sacrifice, then 2 x 5 for the Vortex), so you definitely got the rewards there even if the reward popup never showed up. We've noticed a weird issue with Sacrifice where the soul rewards may not all go into the same slot in the Book of Souls... you may need to pan through a backlog of common Souls to find the multiple stacks of 2 or 3 (instead of one big stack of 13).
Not sure which other sacrifice you're talking about, but I did a quick scan through your (many) sacrifices and you're getting rewards each time, even if the reward popup ended up not showing for you. If you recall what you had in a sacrifice (in terms of character/rarity/etc) where the reward popup didn't show up, let me know and I can double check our analytics.
Very sorry about this issue about the reward popup not showing up sometimes; we suspect it has something to do with the server load on the live servers, as it's something we didn't see as we were finalizing the update. We'll work on better safeguarding to ensure the reward popup shows up even if there's weirdness with the server in the next update.
EDIT: I think I found a few cases where you sacrificed only 5 star eddies:
- At 2017-03-24 22:24:20 server time, sacrificed mostly nat 3 eddies and a few nat 4 eddies (all raised to 5 star) resulted in 10 Rare Souls.
- At 2017-03-24 22:24:44 server time, sacrificed mostly nat 3 eddies and a few nat 4 eddies (again all 5 star) resulted in 15 Rare Souls.
- At 2017-03-24 22:25:08 server time, sacrificed mostly nat 4 eddies and a few nat 5 eddies (all 5 star) resulted 3 Legendary Souls, then a vortex of 2 x 2 Rare Gun/Assassin Souls, 1 Legendary Soul, 1 Skill Shard, and 2 Skill Shards.