One specific and relatively common version of this are people who believe that women have a lower standard deviation on measures of IQ than men. This belief is not incompatible with believing that any particular woman might be astonishingly intelligent, but these people all seem to have a great deal of trouble applying the latter to any particular woman.
Your evidence is not quite about beliefs. I think correct version is:
People that don’t mind to share that they believe that women have a lower… etc.
This can be justified by change of rules: deciders get their part of total sum (to donate it of course). Then expected personal gain before:
Expected personal gain for decider:
Edit: corrected error in value of first expected benefit.
Edit: Hm, it is possible to reformulate Newcomb’s problem in similar fashion. One of subjects (A) is asked whether ze chooses one box or two boxes, another subject (B) is presented with two boxes with content per A’s choice. If they make identical decision, then they have what they choose, otherwise they get nothing.