Images are resized when added to a page

Summary

When adding new image to editor, image size will not be calculated properly and display of the image will be wrong.

Image aspect ratio will be changed and image will not be displayed properly.

Steps to Reproduce

1. Create page
2. Insert image. (we can use default cake.jpg from Confluence upload)
3. Observe default size is 270px
4. Save/Publish page
5. Edit page once again
6. Click on image to see image properties

Expected Results

Clicking on image will show size of 270px

Actual Results

Clicking on image will show size of 271px

Workaround

On second edit of the page, change image size to proper value, save page, value will stay as set.