Hartle ha7000 problem

[joebeadg]

So usually when I run from the onboard DI to the PA I can lower and raise my volume on my amp it doesn’t effect my volume in the PA. But recently every time I raise or lower my volume it effects my volume in the PA. How can I stop that from happening?

 

[Jaco who?]

http://www.samsontech.com/site_media/legacy_docs/5000_7000_manual.pdf

There's a pre di post di switch on the back that may have gotten bumped.