> when redirected from qualtrics to inquisit it appears a message saying "undefined".
This means that a query parameter is faulty. The issue is on the Qualtrics end, double check there. Make sure your query parameters are properly defined and their values are actually properly piped through (look at your browser's address bar).
> &groupid=piped texted one&piped texted 2&piped texted 3
Is not how you properly define query parameters. A given parameter, here:groupid, has a single value, there may not be any ampersand ("&") in its value. Ampersands are there to separate different query parameters.