Measure divided between

Can someone explain to me why the measure is divided between two systems?
I searched everywhere and found nothing on it. See the 2 photos.
How can I repair this?

Ex. 1 Dorico 3.jpeg

Turn on View > Signposts > System Breaks. You’ve almost definitely added a System Break there, which you can delete by selecting and deleting the purple signpost.

Thanks for help, it’s works.
I really like dorico 3.