Hi Volker,
Thanks for the bug report and feedback. We are aware of this issue and have implemented a fix for this to be released in the next version of Spike. I apologize for the inconvenience. This issue was created when we introduced the new sweep plot scaling/zoom features. As you noted, this is limited to the display only, the testing on the limit lines remains unchanged. I can get you a link to a previous version of Spike if desired, or you could wait 2-4 weeks for the next release?
I look forward to your response.
Regards,
Andrew