Cubase 7.5 project in 8, volume problem?

For some reason, when i open the project i’ve been doing on Cubase 7.5

I have set volume of the instrument (bassline) to -3 db, it works perfectly on Cubase 7.5, but when i open it in 8 the volume is too loud. The volume level is same on CB8, but still it’s too loud. Weird.