Hello, @luc.simp
Thanks for the additional information.
Unfortunately, the plugin editor is not yet compatible with the New Responsive Engine. Bubble has confirmed that a new plugin editor engine is under development and has top priority. We will migrate all of our plugins to the New Responsive Engine as soon as we have a chance to have them work properly on it. Here is the announcement from Bubble: Plugin Editor & New Responsive Engine [beta]
For this reason, some issues after upgrading the Responsive Engine could appear.
Anyway, please allow us to investigate the plugin behavior within different types of groups and to revert with feedback ASAP.
In order to continue the work with the plugin, we can advise you to use a simple group ( instead of a row or column group\fixed container and etc.) before we will find a solution 
Thanks for the understanding.
Best regards,
Zeroqode Support Team