[Koha] koha zebra

Dear all, We have koha 22.11.08 for Ubuntu 22 I have a problem related to /var/lib/koha/library/biblios/tmp, this folder have too many files, and the harddisk quickly full /please see zebra-temp.jpg in attached file/. Also running many zebra process via ps aux | grep zebra /please see zebra.jpg in the attached file/. Please advise or give me any comments. Best regards Gana