Hey Carlo,
It sounds like you make have used a template file from the zip file for making user tracks WITH Band-in-a-Box, rather than the one for making them WITHOUT Band-in-a-Box.
The template Song_1m_Jazz_1.sgu is a template for recording a user track in Band-in-a-Box and it defaults to a jazz swing style at 140 bpm. If you used this with a recording at 190 bpm, the user style you're creating could still be set to 140 bpm with a 190 bpm recording. Playing this back at 190 bpm would still treat it like a 140 bpm track, and consequently speed it up.
If this is the case, head to
https://www.pgmusic.com/usertracks1.htm and scroll down until you see the section titled "How to make UserTracks without using Band-in-a-Box® or RealBand". There you will find a zip file you can download that includes a whole bunch of different template songs at various different tempos. When picking one, be sure to pick one that is 190bpm.There is also a very helpful tutorial video there that can help make sure you're following all the right steps.
Let me know if this is what the issue was, or if it's something else I've missed.
Happy music making!