Hi Dev here!
First thank you for taking the time to report bugs.
This is how it works currently: A burn stacks have a duration in which it does damage ticks. When that duration is up every tick after that will decrease the stack count by 1. Next tick the stack count is lower and does less damage and decreases the stack count once again, until you reach zero when the brun is removed.
Adding a burn stack when en enemy is burning resets the duration before it start decreasing.
In this case the burning have started ticking down but you add a stack to it, reset the duration but end up at a different level then first.
Lets take an example.
You get 2 crits in a row and get up to 0→2→4 stacks. Then it ticks down to 4→3→2→1 stack. Then you crit, adding 2 stacks on top of that and get that to 1→3 stacks. Then you crit again and gets it up to 3→5 stacks. Since the blessing maxes out at 6 stacks if you do another crit you will go from 5 → 6.
The da...
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