'X2518 proliferation" of tokens and "W2557 maximum number of active steps/actions cannot be evaluated'.
This warning appears in multiple token mode, in this mode we can have a proliferations of Token in the SFC. The SFC tries to estimate the maximum of active step or active section in the same time and compare with the one assigned by the customer in project settings. If the value calculated is greater than settings value for step or action ,the warning is raised.
The warning must be interpreted a recommendation to increment the limit.
The limit are defined here in project setting.