In your case check for file named as timber.scss and add it to the bottom of that file
Try and let me know if that works.
That is strange. Can you add me as a staff in your store. I will login and fix it for you.
From your Shopify admin, click Settings, and then click Plan and permissions.
In the Staff section of Permissions, click Add staff.
Enter a first name, a last name, and an email address for the new staff member. Make sure to enter the staff member's full name as it appears on any government-issued ID