This package adds a simple indication of the number of lines in selection, number of cursors and number of selections in the buffer
selection-counter can be customized by means of editing the pattern of the text shown in the status bar. It allows the following macros:
%l is replaced by the total number of lines selected,
%c by the number of cursors present, while
%s by the number of selections present.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.