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Why is there such a difference in the gutter flows in my StormCad model?

I noticed in my StormCad model that the gutter flows at a few structures do not seem to make sense. It seems that the gutter flows do not continue to the downstream structure, even though the catch basin inlets are set to "on-grade" and the "maximum capacity" are set to the value that we want to allow in the storm sewers. What could be causing this?

In the first image below, the GU-233 should be around 440 L/s, but it's only 149 L/s.

In the second image, the GU-157 should be appox. 893 L/s, but it's only 379 L/s

What am I doing wrong? Where is the flow going?