Maybe not enough water? Or too infrequent? I notice when I starve mine to get those bags nice and light the bottom fans yellow out like that. Like @Rebel said it is siphoning the N ?
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That's exactly what I'm thinking. Either more at once or more frequently. Some phenos just eat more. But that's good!! If they are eating a lot then they are having to produce a lot. Ime that means lots of branches, buds, resin/oils/terps are in the future.
Large pots are tricky. Finding the sweet spot in watering is more challenging I think.
Dudeski... Do you actually get the autos roots to fill an entire 5 gallon?