In the attached screenshot
there’s a pink box showing time signature information. I don’t know how it got there! Is it important. I have a time signature at the beginning of the piece and I don’t need another one here, but it doesn’t seem to have put an extra one in.
It indicates a barline override or a hidden time signature (which are sort of one-and-the-same). Did you input a normal barline at that position? Try selecting the barline (not the signpost) and pressing Delete.
But if the stray barline override is apparently marked by a time signature signpost, why can’t you delete it by deleting the signpost?