Not every bit is is documented (for various reasons, including that non one bothered to update the docs).
In the case of bit-encoded values, that means that some bits may not be documented, but when you work with bit-encoded values, you don't have to concern yourself with undocumented/uninterested bits in any case, because you have to mask them out.
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It's a real simple question, how can you get "23"? as displayed in the attached image.
Since the value of DBMODE is the SUM of the following integers 1,4,8,16,32.