I recently changed my air filter and found that the box does not completely close and I can see a thin line of Orange Seal of air filter even after the housing is completely tightened.

Is this an issue or is the housing suppose to completely close?

Here are the pics. I don't know the reason why I can see the orange rubber even if the box is completely tightened.

Pretty certain that is how it's supposed to be to make a good seal

yeah, i wouldnt worry about that.

Best to take it out again. Make sure there is not debris underneath or an obstruction, and then re-fit. These things normaly have one way of fitting back together.

 

Autodoc video might help.

 

https://www.youtube.com/watch?v=GMbpm0EG8rM