It's kind of difficult because the question is not clear and the only way to answer is to guess if we understand the real problem and have an answer...
You'll receive tons of guess and, may be, one or two would be really helpful. I would recommend to re-do the question and, as suggested before, attach an screen capture...
I think it is external connection of layout block - pins.
If you use Virtuoso you should switch ON Pin name control in Display option. You will see the names of these pins.