Hello ,
I got 1 Yang’s Bow Primo yesterday , but i use ramaladni in and i see he Don’t got the CDR stats i got just 4 stat + ramaladni and not 5 ! Why ? (Sorry french boy 
)
Yang’s rolls with an innate RCR Property. The 5th Property can also be RCR. For a Primal Yang’s your innate RCR should be 50%. Yours currently says “55%” RCR.
So, if you rerolled RCR, you would have kept the 50% RCR and the extra 5% RCR would have had a chance to roll a 5th Property.
You cannot do that now, because you’ve already rerolled a Secondary Property for +12 Maximum Discipline.
Still, nice bow! 
I hate you! 