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Happened to my teammate, who were very surprised it happened. It's unsure on the cause but just reporting on the situation. It was fine because Ivy was in middle lane, but it Ivy was in side lane for example, there could be some issues getting to lane in time.
If I were to kill the Abrams in the hideout/lobby
here is 2 stacks for example
But when I browse my other games where I used Siphon bullets, it will also say 2 Stacks
Enemy team will also have 2 stacks displayed