What is the problem of adaptability on mobile devices?

Question

Mobile development

There is a site remontstroikomplex.ru/.
When the site width is reduced in the browser, the adaptive layout works and the blocks change their position.
On mobile devices, it is displayed in the version for the desktop monitor, although the parameters seem to be set correctly

<meta name="viewport" content="width=device-width, initial-scale=1.0">

Yes, and bootstrap 3, as elsewhere.
How to properly configure the site so that the site is correctly responsively viewed from mobile devices?

Answer 1

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<meta name="viewport" content="width=device-width, initial-scale=1.0">