You have another repo, which is a bit hidden at the log:
Quote2020-12-03 15:19:09.039 T:1936779712 NOTICE: ADDON: hellyrepo.kodi v0.2.6 installed
Maybe you get add-on update errors from hellyrepo, and those errors avoid add-on updates from other repos:
Quote2020-12-03 15:21:33.690 T:1566417792 DEBUG: Curl::Debug - TEXT: Connected to flex.vodacom.co.za (91.241.95.156) port 80 (#1)
2020-12-03 15:21:33.690 T:1566417792 DEBUG: Curl::Debug - HEADER_OUT: HEAD /err/?err=404 HTTP/1.1