Security updates no longer need to be put in /opt/debextra, they are included by default now.
Also, your libreoffice.md5sum file has 236 entries, mine has 285.
So the next thing to do is to remove the libreoffice.sce* files which can be done with sce-remove. Remove the /opt/debextra/jessie-security file, then reboot, and create a new libreoffice file with the same below entries.
libreoffice-gnome
libreoffice-style-tango
Please also attach your existing libreoffice.sce.lst file.
Thanks