Strange behavior Nextcloud client 2.6 OSX?

Yesterday I installed version 2.6 of the Nextcloud client on an OSX. Enter the URL, no problem, then there is a new window with two buttons: “open in browser” and “copy link”, no query for name or password. I chose “open in browser” and immediately the first account I had before was synchronized with the data of another account of mine. There was also no way to select the folder to synchronize. Due to lack of time I reinstalled the old client. Did I do something wrong on the server or how can I explain the strange behavior?