I see this too, but I'm pretty sure it's because the client generally updates every second, unless actions are happening, then it does it asap or something(aka RT's old boss videos when heals were 1 tick/second Kitty would repeatedly click his face and sometimes get faster than 1s heal ticks). So you see 1 gem cast, 1 second later, another gem casts, but if you get the 3rd one lined up, it's closer to 2 seconds(the full CD), instead of both being the 1.5s apart like they are supposed to be. But this is just me speculating on what I see.
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