What may be happening on your SSTB is that your K-1 entity sells to co-owned SSTB. In that situation, part of the entity's earnings are classified as SSTB and part are not.
If this is your situation, it will require you to enter two K-1s: one for the SSTB portion of QBI income and one for the non-SSTB portion of QBI income. You would "split" the other K-1 box amounts accordingly.
@clinglee
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