What you can see is, that the Stats of the Bow’s P. Attack is misscalculated. Also the M. Atk works correct, the BoP+13 gives me more M.Atk Boost as P.Atk Boost. The P.Atk difference between both Bows are 74. The P.Atk Difference on my Character compared to both Bow is just 35. That alone cant be allright. I hope you find the Problem soon.
Tested it also with a Dagger. A +4 D Dagger had 90 P.Atk. and the +1 C Dagger had 89. The P.Atk calculation on Daggers are fine. The +4 D Dagger gave my Character more P atk as the C Dagger. So its actually ONLY Bow`s P.Atk that seems bugged.
I’ve checked the Patk on the server scripts and it’s actually the exact same as displayed. This must be a client bug, but I’ll keep digging into it. The Matk as you said seems fine, so it has to be just the Patk.