Page Links are not working

Hello everyone,

Since a few days, the links on my side are not working anymore. NEither the links in the page, nor the links in the menu are working correctly.

What is strange, they are working if I open them in a new tab. But they wont open by just clicking on them.

Additionally, the correct “link” appears in the location bar, but wont reconnect.

What might be the problem?
Any ideas?

Thanks in advance,
Julius