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TypeScript number being incremented more than expected

My growthCount variable counts how many new cells appear. Whenever a cell is “split”, growthCount is incremented by 1. The value is then pushed to a state variable growthCounts using a setState. Since this operation is in a setTimeout, it will repeat every specified time interval, and every time growthCount is reset to the value 0. However, when I console.log the growthCount variable after every split, sometimes it will be an unexpectedly large value. For example, in the simulation, 4 cells would split, thus creating 4 new cells, however, growthCount holds a value of 8 for some reason.

allow user to add sp[ace

alphabets,numbers
maximum 30 characters
underscore is allowed
only single underscore, no contiguous underscores are allowed
no more than 2 occurrences of a single underscore
1st occurrence of a underscore is only after at least 3 characters (eg: ABC_123)
the last occurrence of a underscore is only before at least 4 characters (a.k.a there must be 4 characters after the last occurrence of a underscore, eg: ABC_123_EFGH)
Help me with this how to give these expressions