Sounds to me as if you've either uncovered a bug or contracted some
virus,
therefore, I would suggest:
(1) if a bug, then revert back to a previous version before this
occured;
(2) if a virus, then run the various A-V programs until your system
is again clean.
Meanwhile, go behind-the-scenes to the LO file-folder;
gather all your data;
save this elsewhere for safe keeping.
Hoping this helps,