RAM Connection - Flush moment, Mu value cannot find

The flush beam splice connection is set up to support end plates that may be extended above, and below the joint and also works with haunched sections, so it has extra lines in the report for checking bending in those portions of the plates, which may not be relevant for the basic flush beam splice. It's been a while since I had checked the demands, but if you send your file or any example you want me to review I can. 

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The flush beam splice connection is set up to support end plates that may be extended above, and below the joint and also works with haunched sections, so it has extra lines in the report for checking bending in those portions of the plates, which may not be relevant for the basic flush beam splice. It's been a while since I had checked the demands, but if you send your file or any example you want me to review I can. 

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Thanks.
Basically, considering your answer, I would like to know the end-plate design to bending moment. If its not yielding, and if load case is waaaay less than the demand table...then how was it designed? what is the plate design condition for a maximum Mu (Demands Table) of 15.44 kN-m?

You have axial compression forces in conjunction with the moments. If you have moments only then the Mu would directly equate to the demand (at least for Internal flange - flexural yielding for AISC 360-16, flush end plate beam splice)