Feeding Heroes: One at a Time vs. Ten at Once

[Epigenetic]

I did refer to the same phenomenon here:

Correct Probability of Increasing Special Ability

I have a bug that seems a bit trivial but may come up occasionally. This occurred about 10 days ago; sorry I don’t recall the time. I had a 3* hero (Valen) who was fully leveled but had only 5/8 special ability. I got four Valens to level him up and used them at the same time. The game said that he had a 100% chance of increasing his special ability, because it sums four 25% chances. However, in this instance his special ability stayed the same! I suspect what happens is that the game uses…

The bug is not in the code but the percentages displayed that get quite distorted when you are talking about 25% chances.

I have a vague recollection of a character advancing two levels when I fed it 10 heroes but I cannot be sure. If so, then it won’t matter. Based on my experiences above, I think the program runs the same routine 10 times rather than one routine with a variable number of cards.