Strange text appears on front end

Hello there!

When I activate the plugin, the following text appears on the front end when I am logged in:

Feature User Time System Time Sum
paymill_load_config 0.004 0 0.004
paymill_load_subscription_wrapper 0 0 0
paymill_setup 0 0 0
paymill_load_scripts 0 0 0
paymill_load_integration_classes 0 0 0
paymill_load_API 0 0 0
paymill_load_translation 0 0 0
paymill_API_paymill_errors_loaded 0 0 0
paymill_API_paymill_errors_initialized 0 0 0
Sum 0.004 0 0.004

https://www.ads-software.com/plugins/paymill/