[Plugin: WP Calendar] Breaks images

hi
widget moving is not possible in the settings page. despite that, it should not affect other functions. the plug-in does not use any hook on the frontend and use only built-in libraries from wordpress by calling in the wp standard way (no direct including). on my back end and front end everything works in the normal way.
if you could specifiy “breaks the wordpress admin JS” more precisely, this would be very helpful to find the error.

thx and greets
faebu