Good day.
I am trying to set up a test environment by migrating our productive system (see https://confluence.atlassian.com/conf59/migrating-confluence-between-servers-792499892.html). This works fine so far. The only thing I change on the testing system is the License Key and the URL.
Then I export one of our spaces as PDF and I notice that 99 % of our tables has a line break in every cell, which makes it look like you can see on the attached picture.

I checked if all the Layout and Stylesheet customizations are correctly inherited from the productive system, and they are.
The Confluence versions of both systems is 6.6.0 but obviously the export is handled different.
Can anyone tell me please why is that happening and how to fix the problem?
Thank you