I face the following issue on a specific survey, which cannot be reproduced to any environment either than the production one to which I don't have access.
In a survey the Detailed admin notification email received is broken.
The limesurvey installation version is quite old 2.05+.
I exported the survey from the production environment and imported locally but I cannot reproduce it.

The part of the email that is broken is the {ANSWERTABLE}.
Instead of presenting the answers in a table, they are displayed as plain text.
If I see the received email source I see that the HTML tags are wrong:
<ta! ble="" class="printouttable">

But the code that produces the ANSWERTABLE is correct.
Any ideas what could be wrong or what to check?

Are the other installations your are testing the same exact version of LS?

Could be a problem of exactly the version used on the production server that has been fixed long time ago.

By the way: This version should not be online anymore. It is not even the latest version of that branch, which should be something around 2.6.6 LTS or something. This version hasn't received bug fixed and security updates for a long time.

Time to update. Ideally to 3.x LTS (currently I can't recommend LS 4.x for production).