Bootsrap carousel for post

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You have added active class in all slides. Due to this all slides is displaying. You have to add active class to first slides only. Check below bootstrap slider code-

<div class="carousel-inner" role="listbox">
    <div class="item active">
      <img src="https://wordpress.stackexchange.com/questions/235599/..." alt="https://wordpress.stackexchange.com/questions/235599/...">
      <div class="carousel-caption">
        ...
      </div>
    </div>
    <div class="item">
      <img src="https://wordpress.stackexchange.com/questions/235599/..." alt="https://wordpress.stackexchange.com/questions/235599/...">
      <div class="carousel-caption">
        ...
      </div>
    </div>
    ...
  </div>