[Theme: HashOne] Missing sidebar in Category page

I’ve installed a HashOne theme from Hash Themes, and I’m missing a sidebar in the category page (https://i68.tinypic.com/2colq9g.jpg). I’ve tried other themes and I can see the sidebar there. Also, I know that the sidebar should be there (I saw it in the demo and I use other theme from the Hash Themes and I have the sidebar there). Here’s the sidebar in pages, where is vissible: https://i66.tinypic.com/2d7x8hz.jpg. I see it in pages, but in every category page (licegrada.hr/category/xy-name) there is no sidebar.

I tried almost everything in the settings, reinstalled the theme, changed the theme, disabled plugins… Now I don’t have any idea what to try next..

Thank you for your help in advance,
Ivan