Arithmetic assignment operators (e.g. +=, *=) in Niagara inputs are applied twice .

Arithmetic assignment operators seem to be applied twice when committed in the Niagara stack.  This occurs when entering *= 2.0 for example into a float input.

This may be the result of the SNiagaraParameterEditor calling ValueChanged from ValueCommitted.

1. Open or create a Niagara system or emitter
2. In a float input field replace the input with "*=2"

Result

Instead of doubling the value, the value is quadrupled. For example an initial value of 5.0 would become 20.0 instead of 10.0.