You debug log is abnormal in that if were not manually edited by you personally prior to posting, it appears that Calibre began to start, and then started over from the beginning. See the extract of your log below. However, if you did redact it, you really need to attach the original debug log from a single execution of Calibre with debug turned on.
Code:
calibre Debug log
calibre 3.17 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.16299-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.16299')
Python 2.7.12+
Windows: ('10', '10.0.16299', 'SP0', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 5, 3) && Find Duplicates (1, 6, 3) && Audit Log (1, 0, 8) && EpubMerge (2, 1, 1) && Quality Check (1, 9, 11) && Barnes & Noble (1, 2, 14) && Goodreads (1, 1, 13) && Reading List (1, 6, 6) && Count Pages (1, 8, 0) && Goodreads Sync (1, 11, 0)
calibre 3.17 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.16299-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.16299')
Python 2.7.12+
Windows: ('10', '10.0.16299', 'SP0', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 5, 3) && Find Duplicates (1, 6, 3) && Audit Log (1, 0, 8) && EpubMerge (2, 1, 1) && Quality Check (1, 9, 11) && Barnes & Noble (1, 2, 14) && Goodreads (1, 1, 13) && Reading List (1, 6, 6) && Count Pages (1, 8, 0) && Goodreads Sync (1, 11, 0)