Here’s the thing: Humans are really good at a couple things. Recognizing patterns is one of them. We’re so good at it, we see faces in things that aren’t faces all the time. The idea that there is an absence of pattern is a nightmare to our brains, so we force patterns on everything. To aid in this, our brains use some really neat tricks to hack our memories. Here are a few specific ones that apply to this subject:

Oh, and humans are also really bad at probability and statistics. So many times I see people claiming that they know fusing is rigged because they looked at 5, 10, or even 20 fuses in a row. The problem is, those aren’t nearly enough data points to reliably see an average. One disconnect is that the number of perceived outcomes is far less than the number of actual outcomes. What I mean by that is the players only see 10 possible outcomes from fusing 10 - 100. In reality, the game sees 1,239 possible outcomes. 500 of those happen to result in a fuse of 10. 500/1239 is where 40.36% comes from. There’s only 1 out of those 1,239 outcomes that results in a 100. So think of your sample set from the game’s perspective. Imagine that when you fuse you were seeing those 1,239 unique numbers. How many fuses do you think you would need before you saw a fair distribution? Those 20 fuses you cited before are a mere drop in the bucket.