The Bulk conversion at end of process result is generated from a Midplane and Dual Domain Reactive Molding analysis, and shows the average material conversion (cure) across the part thickness, calculated at the end of the filling phase.
Premature conversion is a typical molding problem and occurs when the material solidifies (cures) in the mold cavity before the curing phase is complete. If the material pre-cures, you will see an acceleration of the melt, followed by strong hesitation, that is, viscosity suddenly decreases because material is too hot, then abruptly increases as material pre-cures.
If pre-cure occurs, increase the specified curing time until conversion throughout the entire part reaches the recommended Ejection conversion value for the material.