The noissuescharge, noissueschargeguarantees, and noissueschargeguarantorswithguarantees columns for patron categories are INT 10 in the database but presented as currency units with decimals in staff interface. The form inputs are presented on the /koha-tmpl/intranet-tmpl/prog/en/modules/admin/categories.tt template. For instance, if you save a patron category's "noissuescharge" value as "50.50" it is rounded up to "51" in the database. This is unanticipated behavior for administrators. The alternative to making database changes is to remove the $Price on_editing filters from the template, the decimal pattern regex, and make it clear that these are integers representing a currency unit. This is obviously easier but I don't know how important decimal charges are to other libraries (we could do fine without them). The "noissuescharge" syspref is an integer.