Massive, unexplained codec issues (?), but only with certain sites

#  | Alias                                | Name                    | Enabled | GPG Check | Refresh | Priority | Type   | URI                                                                                          | Service
---+--------------------------------------+-------------------------+---------+-----------+---------+----------+--------+----------------------------------------------------------------------------------------------+--------
 1 | 1password                            | "1Password Stable Cha-> | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | https://downloads.1password.com/linux/rpm/stable/x86_64                                      | 
 2 | https-download.opensuse.org-c1effed8 | openSUSE:Factory        | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | https://download.opensuse.org/tumbleweed/repo/oss/                                           | 
 3 | microsoft-edge                       | microsoft-edge          | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | https://packages.microsoft.com/yumrepos/edge/                                                | 
 4 | openSUSE-20240716-0                  | openSUSE-20240716-0     | No      | ----      | ----    |   99     | rpm-md | hd:/?device=/dev/disk/by-id/usb-Kingston_DataTraveler_3.0_60A44C3FACCEE271896A04AF-0:0-part2 | 
 5 | packman                              | packman                 | Yes     | (r ) Yes  | Yes     |   90     | rpm-md | https://ftp.gwdg.de/pub/linux/misc/packman/suse/openSUSE_Tumbleweed/                         | 
 6 | repo-debug                           | openSUSE-Tumbleweed-D-> | No      | ----      | ----    |   99     | N/A    | http://download.opensuse.org/debug/tumbleweed/repo/oss/                                      | 
 7 | repo-non-oss                         | openSUSE-Tumbleweed-N-> | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://download.opensuse.org/tumbleweed/repo/non-oss/                                        | 
 8 | repo-openh264                        | Open H.264 Codec (ope-> | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://codecs.opensuse.org/openh264/openSUSE_Tumbleweed                                      | 
 9 | repo-oss                             | openSUSE-Tumbleweed-Oss | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://download.opensuse.org/tumbleweed/repo/oss/                                            | 
10 | repo-source                          | openSUSE-Tumbleweed-S-> | No      | ----      | ----    |   99     | N/A    | http://download.opensuse.org/source/tumbleweed/repo/oss/                                     | 
11 | repo-update                          | openSUSE-Tumbleweed-U-> | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | http://download.opensuse.org/update/tumbleweed/                                              | 
12 | vivaldi                              | vivaldi                 | Yes     | (r ) Yes  | Yes     |   99     | rpm-md | https://repo.vivaldi.com/archive/rpm/x86_64

Edit by Sauerland:
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