I am having the EXACT same problem as reported in this thread. Most specifically here: https://discussion.evernote.com/forums/topic/133340-web-client-cursor-jumps-to-top-of-note-while-typing/?do=findComment&comment=602583
I am on Windows 10, Using MS Edge
Microsoft Edge is up to date.
Version 88.0.705.50 (Official build) (64-bit)
Evernote is installed as a PWA. This has worked GREAT up until about 2 weeks ago or so - not sure of exact time. It is rendering my Evernote experience frustrating and close to useless. May have to switch to OneNote.. : (