My analysis
No rewards disappear or get lost (not talking about the crafting plan issue here, that has his own threads already). There's just a bug in the Rewards message: when you click on OKAY, it "rewards" you all the coins/credits/reputation for the second time (after each battle you are instantly rewarded with coins, credits and reputation already), but only client-side. The server doesn't double the rewards, so after reloading/refreshing the game the correct numbers are shown, which indeed looks like the rewards "disappeared".

Fix and suggestion
The Rewards message needs a fix, so it doesn't "give" the coins/credits/reputation for the second time when you click on OKAY. (Unless we're supposed to get our rewards doubled of course, but then there should be more fixing done.) For clarity, I suggest to separate the total gains during the fight (coins, credits, reputation), and the rewards given at the end (chip, crafting plan, guild contibution).

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Some more detail:

Both with Cerberus and Baal yesterday I kept track of the the coins/credits/reputation gained in each round, as well as the numbers before and after the banishing (rounded number for coins: the last three digits are not given when >1,000K coins).

  • After the fight with Cerberus I accidentally clicked somewhere on the screen, causing the Rewards message to disappear. I thought I missed the rewards that way, but I did receive the chip (ranked #6), and the coins/credits/reputation gains matched with what I had noted down (credits and reputation were off by 1 though).
  • After the fight with Baal I clicked on OKAY in the Rewards message, and the well-known effect of coins and credits flying to the corner was shown. (Also this time I received the chip just fine; ranked #5.) The coins/credits/reputation gains seemed to have doubled though: the Rewards message said I was rewarded 189,085/75,634/189; my noted numbers added up to 189,087/75,634/188; the increase between before and after the banishing was twice as much. After a short while I reloaded the game, and I noticed a drop in my coins/credits/reputation as described in this thread.