Can you show the appearance panel for one of the shapes that appears to not be 1pt?
And check the Brushes panel for anything other than Basic
And if you select the Basic brush option?
I see what you mean now, and yes, that fixed it. Thank you!
Good to hear that helped.
The brushes can be confusing, you can change the default 3 pt. Round to 5 pt without changing its name and see 1 pt in the stroke panel.
Thanks! This has just solved my problem too!