I am not sure but possible in dns table of kloxo database, 'dmac' and '_dmarc' save in the same variable (where variable is 'dmarc'). And it's make Kloxo-MR panel confuse with this situation.
By default, Kloxo not accept variable like '_dmarc' (include '_' in front). In Kloxo-MR, '_dmarc' still accept but need to convert '_dmarc' to 'dmarc' and then save as 'hostname'.