The usual gamers fallicy...
"Again, the fallacy is the belief that the "universe" somehow carries a memory of past results which tend to favor or disfavor future outcomes."
It's a 20% chance each time you re an item, it's not a 20% chance of all your re attempts.
QFT. The same arguement was in LOTRO about percentage chances. Its based on that one attempt, not the percentage of all your attempts