I have been going in circles trying to find a compatible pen for my Note 8. Many that claim compatibility have an offset when in use. Pens that I have tried:
Wacom Bamboo Stylus Feel CS300UK from Best Buy - 2mm offset & reported by many.
On order Wacom Bamboo Stylus Feel CS300UK2 - said to be compatible.
Samsung S Pen and Holder Kit. <2mm offset.
The supplied pen & a replacement Galaxy Note 8 stylus work fine with no offset.
There is a good thread at xda regarding the same issues with the Galaxy Note 10.1. I am not sure if the information pertaining to the Note 10.1 can be applied to the Note 8.
BTW The offset is present with the 4 app that I have tried.
It would be nice to see a chart of compatible pens, listing various tablets & the cross platform compatibility of the pens. Many products are listed as "compatible with Samsung Galaxy Note", but there appears to be some variance between the Galaxy Note products related to this offset. Otherwise they work fine.