Debut theme: Drop down menu width changes in a specific page after clicked

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I have a few questions regarding to the dropdown menu in my store.

Everything looks fine if I am in the Home Page (dropdown menu is right under the navigation name, the width of each dropdown menu is consistent, and the sub menu has only 1 column. 

1) After clicked Products, you will realized that one of the sub menu from Products has moved to the right/another column, but I would like it to stay at the same column like how it looks in the Home page.

2) If you clicked Collection, it will bring you to the Matter Black Series page. If you move your mouse to the Collection, the width of it's dropdown menu changed to a smaller width. 

Why and how should I change it? Thanks a lot guys! 

My shop URL:    PW: comingsoon