The butter content is definitely pretty high in that one, what you experienced is almost certainly residual "superfat" in the form of one or both of the listed butters. I won't pretend to know how they actually MADE the soap but based on the label it is clear they used plenty of butters, whether they added those butters during the cook and as part of the saponification process or after the cook (so they are still 'raw') or a mix of both is a matter of CRSW secrecy. I will say strictly from a chemistry perspective a butter that has been saponified (exposed to lye and turned to 'soap') there are parts of that butter that will remain in the soap as 'unsaponified solids' and those unsaponified solids are often considered desirable components because they produce a particular feel or effect. I include this information because the soap maker may choose to turn the butter to soap or leave it as a raw butter or both in order to achieve a particular outcome. Having said ALL of that about the butters listed in such high concentration, it is also very possible the waxy substance you encountered is as simple as the lanolin (a wax) added in a smaller amount. Kokum butter and Shea butter typically melt at skin temp and absorb well while lanolin is often apt to form a waxy (protective) layer on the skin.