HTML entities showing in title

It has to be solved within JEM. If you do a search for the same item, the title in the search results is shown correctly.
www.ugenda.nl/mobiel-zoek?searchword=Jinjer&ordering=newest&searchphrase=all&limit=25
So somewhere the JEM template (override) has a problem.

Just for information:
jem-test.lkgchemnitz.de/simplelist/event/7673-fortarock-jinjer-humanity-s-last-breath-hypno5-e-uitverkocht
No problem on my test page.

Let's talk about database collation.
My testpage uses MySQL. The general collation of the database is "latin1_swedish_ci".
The tables have their own collations:
_comproifiler_... -> latin1_swedish_ci
all other joomla tables -> utf8mb4_unicode_ci
jem tables -> utf8_general_ci

Whats about your database?