Why isn't the Bootstrap block hidden?

Question

Bootstrap

Tell me, please. Why are both blocks visible in this block at resolutions of 1199px and 991px? A pixel less, a pixel more, everything is fine. Is it possible to get rid of this effect?

<div class="row">
    <div class="col-md-6 hidden-lg hidden-sm">1111111111111111111111</div>
    <div class="col-sm-6 hidden-md">222222222222222222222</div>
</div>

Answer 1

Do you have a container for layout?

<div class="container">
<div class="row">
    <div class="col-md-6 hidden-lg hidden-sm">1111111111111111111111</div>
    <div class="col-sm-6 hidden-md">222222222222222222222</div>
</div>
</div>

Bootstrap has no transitional (lost permissions, but site templates have their own blackjack, where their own medias are wound on top of the bootstrap)
Here are the permissions of the bootstrap

xs  (<768px)   
sm  (≥768px)
md (≥992px)
lg (≥1200px)

as you can see none of your permissions are here. And in 1 extra pixel.
Give a link to the site.