Scenario connection Problem

Hello everyone, I have a problem with a game I'm doing. Has a stage that moves in a loop. The connection between the parts of the scenario are leaving a small space! when one part of the scene comes at a certain position, it returns to a position before the camera and so making a loop. The problem is that when she returns, she leaves a small space, a line showing the division of parts of the scenario.

I did two tests: one using the movement with Time.deltaTime and one without. The Time.deltaTime appears with this line showing a tiny gap in the division. The test without Time.deltaTime does not appear! But if you do not use the Time.deltaTime, depending on the computer, the scenario may be faster or slower ... how do I fix this?!