External clock, get tempo

[localhero44]

Hello,
This library is very interesting, I've tested it but I am facing a problem.
With external clock, when I use getTempo() it's not a stable tempo.
And I would like to know why the tempo is a float, while in every DAW it's an unsigned int.

For example when I send the clock with MIDIOX, or Reason, let's say 100 BPM, getTempo() gives me 100.1 but also 99.6.
Am I missing something ?

Maybe it's only a USB problem, as here I am only testing with USB Midi.

Regards