Thanks Pascal.
This problem is a little annoying. If I translate "Showing %1$d - %2$d of %3$d items" with "%1$d - %2$d to %3$d items" the problem remains, but if I translate as "From %1$d to %2$d of %3$d items" the problem disappears.
Apparently, according to PS, the sentence can not start with a numeric variable ...