I have been using Standard Record Detail info adding it into Lightning App Builder to display fields of an custom object that I have created.
On Page layout, I have created a couple of sections to separate this fields information:
And it is showed like this on Lightning Experience:
I can edit, save and everything is working as expected, but if I collapse/expand a section and edit it again, I see duplicated information as here:
I have tried on a Trailhead org and a Developer Org and it is happening in both. Is this a known issue? Thanks.