We've got some reports of this but unfortunately can't reproduce it. It seems to happen to some users using Apple Pencil 2 on iPad Pro. According to some research we've done (*), it's not specific to GoodNotes and we suspect it could be related to the amount of wear and tear of the Apple Pencil. If you happen to have another one to try, see if it also causes this issue.
For now, here are some suggestions that work for some users. See if any of them work for you too:
- Make sure your Apple Pencil is indeed working correctly.
- Use the Fountain Pen instead.
- Don't use the iPad while it's charging, and if you have to, use an Apple charger, not a third-party one.
- Set Palm Rejection in GoodNotes to High.
- Keep your palm and the glass surface dry.
If the issue is still there, please send us some Diagnostic Data for investigation: Just open GoodNotes menu (Gear icon) in the top-right corner of the Documents tab > About > Export Diagnostic Data.
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(*) References:
https://discussions.apple.com/thread/7622195
https://discussions.apple.com/thread/7913829
https://forums.macrumors.com/threads/ever-seen-this-weird-apple-pencil-glitch.2019539/
https://www.reddit.com/r/ipad/comments/hyssbv/ipad_pro_with_apple_pencil_behaving_weird_what/