Interaction ratio for single angles

STAAD output is providing me an interaction ratio for a single angle member of more than 2000 for clause H1-1 of AISC ASD code criteria. When I verify this by hand, the interaction of fa/Fa alone is greater than 0.15 which tells me that H1-1 no longer applies and H1-2 should be used.

Does anyone has seen this problem before? Your help will be greatly appreciated! Thanks!

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