Tabs not loading correctly

Hello,

I have the plugin installed here (bottom right corner):

https://www.masca.ro/teatru/

If I reload the page, 8 times out of 10 the tabs don’t work, the second tab just list the items under the first tab rss items.

I tried disabling other plugins, it’s the same and it’s killing me, I don’t understand why it’s not working properly.

Can you help?

https://www.ads-software.com/extend/plugins/super-rss-reader/