Custom Fields in every widget

Hi Shambhu Patnaik,
thank you very much for this great plugin!
I have a little problem: custom fields are displayed in every widget (see http://lesesommer.lbz-rlp.de/buchtipps/titel-2/).
What can I do to make them disapear? Any pointers are greatly appreciated!

https://wordpress.org/plugins/custom-fields-display/