Wait, that's how the Animus book FATES work?

[m3eansean]

I can only assume doing other FATE's will clear the area and push other FATE's upwards, because I've been in some areas where literally the same FATE pops over and over again about 3-4 times 2-3 minutes after the timer runs out.

I can't find the exact thread, but the Devs actually did respond to this and said there is a limit to how many fates can appear in a zone, and if you a trying to get a specific fate to appear, clearing other fates in the zone will increase the speed at which your target fate can appear as you are freeing up space.