Problem with tempo track

[Tozser]

I have a problem with the midi player in Juno Stage. I would like to use the midi files and play together with them. However, for some reasons the tempo starts many times incorrectly. I set the tempo to the desired one in the perform set and also in the midi file, but sometimes the song stats with a slower tempo. For example with something like 78 instead of 96. By the way, why the tempo shows 120 if I step forward/backward with the songs in Perform mode?
Thanks for the help in advance
Jozsef Tozser