We've found out the reason and will fix it soon.

ok! now we see. thank you for your report! we'll try to fix it soon.

You can restore your data in Backups tab in EverSync.

Hello! We'll try to fix it soon.

Please, make video for us. 

Openin dials in background is made for preview getting process. You mean that you have preview windows opened or whole Firefox browser opened in windowed mode?

You can do this via EverSync

Thank you! We'll try to fix it soon.

Very sorry about it.

First you should understand that the extension can't tell Chrome what to sync. If you don't want to get your bookmarks on your wife's account, then you should delete them on her account. Also check all devices that keep her account. Sometimes it's hard to control what data Google keeps, but that how it works and we can't have influence on Google Chrome browsers. 

Our extension does bookmarks synchronization only between EverSync apps. If you have bookmarks downloaded into your browser from our servers, then Google will definitely use this browser data to update your google account. If you log in with your wife's google account it is going to use bookmarks in your browser and will upload them to Google servers. And it doesn't matter how did you added bookmarks. That's why we recommend to turn off Google Sync of bookmarks on all devices and use EverSync. To avoid conflicts of two sync apps.

Chrome Sync of bookmarks must be off.