That looks like it might be a bad translation string causing that to happen. Does the issue go away if you load up the default translation file (the .mo file) available from the GlotPress site? It can be exported from here:
The support post ‘issue on ticket details’ is closed to new replies.
Have a question about this support post? Create a new support post in our support forums and include a link to this existing support post so we can help you.
Support forum for Event Espresso 3 and Event Espresso 4.