[NTG-context] formatted pagenumbers in registers

I have noticed a strange irregularity in the formatting of pagenumbers in one of my registers. Somehow not every pagenumber that should be bold has been rendered bold. I have defined this register as follows. <cite> \defineregister[indexri][Dialect of Riustring 1] % \setupregister[indexri][lemma][pagestyle=bold] </cited> Does anyone know how to solve this problem? Sjoerd