breadcrumbs don't work properly on some pages

hello
1. I have installed K2 on my website and I realized that breadcrumbs don't work properly on some pages:
http://katarzynaderen.pl/component/k2/item/1-artykul-1
http://katarzynaderen.pl/rejestracja

2. Also 'disqus for K2' plugin doesn't work

Please help. Regards,

Hi,
please check if on default template you don't see breadcrumbs on this same subpages.

Also 'disqus for K2' plugin doesn't work

1) We don't have to support all plugins from JED
2) Try different solution, always there is a replacement.

Sorry maybe it's stupid question from me,
but are you sure that you have to use K2 items for such a easy website?
For most users K2 is not so simple as default Joomla article system, in particular it does not available a next version of K2 I mean 3.x

Read: https://www.gavick.com/documentation/su ... oomla-3-1/

p.s.
You should be on JoomlaDay Poland (tomorrow is last day)

NOTE:
breadcrumbs - are generated by Joomla system not by template, template can only show content from it. Those "links" work especially good when items are connected with menu items. Maybe that's why content of "breadcrumbs" are empty on those two links from your example.

I would love to be on Joomla Days but unfortunately I can't.
Yes, I am sure about K2, that components gives much more features than default Joomla articles system.
You have right, breadcrumbs works well with menu items.
Regards,