JFugue Android 40BPM until 57BPM error

Question

When I set T40 it supposed to play in tempo 40 bpm but it plays in tempo 135 bpm!!! When I set T41 it is in tempo 145 bpm and this continue until T57. From T58 it is ok I mean is in tempo 58 bpm.

Pattern pattern = new Pattern("T40 V0 I[Piano] Cq Cq Cq Cq");
Player player = new Player();
player.play(pattern);

The same error occur again when I set T[Grave] .It supposed to be in tempo 40 bpm but it is again in tempo 135 bpm!!!

Pattern pattern = new Pattern("T[Grave] V0 I[Piano] Cq Cq Cq Cq");
Player player = new Player();
player.play(pattern);