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The AISC 360-16 code check is considering incorrect value of Cw for non-General UPT sections and non-Isections (WF, S, M, HP types) like Channels when the following conditions co-exist
The model contains General UPT sections or I-section (WF, S, M, HP types).
The sections mentioned in (a) are designed in the same CHECK CODE command along with non-General UPT sections and non-Isections (WF, S, M, HP types) and the former sections are checked ahead of later
For the above situations the software is incorrectly considering the Cw value used to check the last General UPT sections or I-section (WF, S, M, HP types) and using that for the other section types. This is causing the LTB checks to be incorrect for the other section types.
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Workaround
There are a couple of workarounds which may be used
Solution
The defect is being addressed and a fix will be available in the upcoming STAAD.Pro CONNECT Edition V22 Update 5, scheduled to be released in September of 2020.