Not only are you using a red stroke but I notice you are also using a white fill. Is it possible that you have drawn shapes, or even open paths, that have a white fill that are obscuring objects below? If so, you could… Select everything and set the fill of everything to "None". Menu > View > Outline: This will show you your paths without any Strokes or Fills. Make sure you select "Menu > View > Preview" to get back to the default view.
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