Wierd things happening when I creat group tracks

When I create a new group track in the mixer I first get a different instrument or I get the selected instruments and suddenly they have reverb and traces of other tracks on them. Sometimes this is intermittent and other times permanent. Often I have to create one buss first, then another to get what I require. Help please. The only thing I can think of is that i use a very low buffer and my computer is working hard to assemble everything.

Can you describe the exact steps you are taking to do this. There are a variety of different ways to create Group Tracks & without knowing what you are doing we can’t really suggest what you should do differently.