[Plugin: jQuery Colorbox] jQuery Colorbox not working

For some time the plugin does’t work. I turn off all the other plugins – it didn’t work. On my other side, the plug is working properly. Please check ex.:

https://www.absolwencinawalizkach.pl/jak-stworzyc-efekt-plomieniognistej-kuli-w-gimpie

Instead class colorbox-XXX is colorbox-manual…

https://www.ads-software.com/extend/plugins/jquery-colorbox/