Blackboard and Graph Variables are set/updated with the Set Variable node (you have used one such node in the screenshot bottom left), only when the node’s flow input is called.
The reason why the node returns a different value (3 shown as different in your example) is probably because the Set Variable node is not called before its value output is retrieved and thus the previous set value is returned for example, which depends on the order you’ve set up the nodes to execute. Could that be the reason in your case?
Let me know.
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