First of all, I want to warn you that the content may be bizarre using a translator.
This message means that creepers killed by Skeleton arrows have a chance to drop a music disc. It is written. (Loading screen)

Here, please pay attention to the '확률ㄹ'

The correct Korean notation is '확률', not 확률ㄹ.

There seems to have been a typo in the process of attaching the message "확률로".