transport TIME seems to be inacurate

The song is a steady 110bpm and is 109 bars in length. The
numbers would cruch as follows

https://toolstud.io/music/song-length.php?bpm=110&bpm_unit=4%2F4&repetitions=109&repetitions_unit=bars

for a total time of 3:58 BUT when the Rosegarden transport indicator
is slewed from zero to the end of bar 109 the counter shows 4:02. I
don't know what to make of this.