Sharepoint sync sets every document to read-only

Hi,

I've made some adjustments to the library we are using, but now users can't direct edit the items in the desktop. However, I can.

They see the following:

• Green locks on every document
• When they open a document its in read-only mode
• When they try to upload a new document they are asked for administrator rights.

Sceenshot: https://i.stack.imgur.com/6ochP.png

How do I fix this? So that every user is able again to edit and upload documents on the fly.

Thank you.