Thanks for the post and sorry for the trouble with this! We might need a little more info to be able to make a helpful recommendation here. For instance, it looks like you’re grouping by a date field that is different than the date fields you have highlighted in the screenshots you shared. And it’s hard to tell from the screenshots what data types those are and how they relate to the dynamic expressions you have in the first screenshot.
Feel free to shoot us an email at Support@Bubble.io with some more details and we’d be happy to get you pointed in the right directly.