The "/continue" thing tends to go off when a previous job couldn't be completed because a reboot was needed. I've not seen it trigger off a staging task though ...
however - to help you out here, you may want to consider specifying maintenance windows for your servers if nothing else
This is assuming you're using 9.5 (which seems reasonable, given that 9.5 introduced the "/continue" feature IIRC). This should help you have an additional safeguard against unintended or otherwise accidental people triggering vulscan to read the CONTINUE-key ...
Hope this helps.
- Paul Hoffmann