Eyery picture i upload in confluence has a white frame around, why?

[Alexander Schlenkrich]

Eyery picture i upload in confluence has a white frame around, why? 

Confluence cut be a bit better.

[Angélica Luz]

Hello @Alexander Schlenkrich,

Welcome to Atlassian Community!

Testing on my local Confluence, I added some images to a page, most of them are dark, so it would be easier to see the white frame, but in none of them, a white frame appears. 

With this said, for a better understanding of the issue, I would like to know if you can share with us a screenshot of the issue.

Is it happening with any type of image? 

Is it happening to other Confluence users?

Regards,
Angélica