Thanks for joining us in the Community, We can certainly agree its helpful to keep your list consistent with people that unsubscribed. We see things like this usually happen as a result of browser issues but we have some suggestions to help you successfully work in your account.
Have you tried using an alternate web browser or have you tried a private viewing window?
Another option you can look into is locate the advanced permissions settings within your My Settings page and that will allow you to upload contacts directly to unsubscribe. For more information on this please click here.
Tiago_R Community & Social Media Support
If you find my post helpful, and it answers your question, please mark it as an "Accepted Solution" by clicking the Accept as Solution button in the bottom right hand corner of this post.
Increase your profitability by integrating your email marketing and social media. Download this guide and learn how you can achieve great results with email marketing