Questions about depletion on fixed source simulation

Dear exports,
I have a question about the depletion on fixed source simulation.I want to do transmutation calculations on a cube, and I know we can’t specify a specific energy spectrum, so I’m going to use openmc.stats.Discrete to accept 315 single energy groups and the corresponding intensities, but the results seem to be a bit problematic. Here is a simple screenshot of the code, where does the problem occur please.
Tthank you very much for your help.