Illustrator groups unintended objects, you can't ungroup unless you click on a certain object.
I've had this issue for years with various versions of Illustrator. Occasionally when grouping and ungrouping objects Illustrator will get stuck on a grouped object and then subsequently clicked objects with that object.
It's annoying because it creates unwanted group handles for the subsequent object you want to click or transform.
Over the years I've found that the only way to "ungroup" the unwanted group is trying to find and select one of the objects that is "causing" the unwanted grouping for lack of a better explanation.
Again, this is not a new bug. It's something that I've been dealing with in Illustrator for multiple versions.
lease accept my sincere apology for the inconvenience. Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
Thanks & Regards,
Brandon DeWeese commented
Why hasnt this been fixed?