Hello,
One of our developers was able to reproduce the same issue on his machine. It's really hard to tell when this bug occurs, but we can provide a fix for this issue.
Please see the attached file, unzip it and place the *.css in data\Base_Theme\templates\default\Base\Box, then reload (F5) epesi.
This should fix the issue.
Thank you for your report.
Kind regards,
Arek