Table misalignment in e-mails

[Matje]

Hello all!

We are testing our shop in the new version of Prestashop 8.1.1.
Now there is a problem with the table in the e-mail order confirmation. The table is misaligned.

 

It happens after I edit the e-mail template, even if I only open and save the template.
It appears only in the e-mails, not if I view the html-file in a browser.
It occurs with the built-in editor and also if I use an external editor.
When I regenerate the templates from the e-mail theme, the table is right again.
There are no error warnings, and changes in the content appear as expected.
I only found this topic in the forums which looks like the same problem:

Has anyone an idea what causes this?