Conflitto tra le mie row e le row di bootstrap

[he-man]

Provato ma credo che il problema non sia lì perchè lo spazio tra una riga e l'altra rimane. Inserisco le due parti di codice tra cui si forma il vuoto

<div id="b1" class="containerTab" style="display:none;background:#fff">
  <span onclick="this.parentElement.style.display='none'" class="closebtn">&times;</span>
  <div class="row">
    <div class="col"><img src="img.jpg" alt="..." class="img-fluid"></div>
    <div class="col"><h2 style="color:grey;">testo</h2><p>testo testo</p></div>
  </div>
  
</div>

<div id="b2" class="containerTab" style="display:none;background:#fff">
  <span onclick="this.parentElement.style.display='none'" class="closebtn">&times;</span>
  <div class="row">
    <div class="col"><img src="img2.jpg" alt="..." class="img-fluid"></div>
   <div class="col"><h2 style="color:grey;">testo</h2><p>testo testo</p></div>
</div>

<div id="b3" class="containerTab" style="display:none;background:#fff">
  <span onclick="this.parentElement.style.display='none'" class="closebtn">&times;</span>
 <div class="row">
    <div class="col"><img src="img3.jpg" alt="..." class="img-fluid"></div>
    <div class="col"><h2 style="color:grey;">testo</h2><p>testo testo</p></div>
  </div>
</div>

e

<div id="b4" class="containerTab" style="display:none;background:#fff">
  <span onclick="this.parentElement.style.display='none'" class="closebtn">&times;</span>
  <div class="row">
    <div class="col"><img src="img4.jpg" alt="..." class="img-fluid"></div>
    <div class="col"><h2 style="color:grey;">testo</h2><p>testo testo</p></div>
  </div>
  
</div>

<div id="b5" class="containerTab" style="display:none;background:#fff">
  <span onclick="this.parentElement.style.display='none'" class="closebtn">&times;</span>
  <div class="row">
    <div class="col"><img src="img5.jpg" alt="..." class="img-fluid"></div>
   <div class="col"><h2 style="color:grey;">testo</h2><p>testo testo</p></div>
</div>

<div id="b6" class="containerTab" style="display:none;background:#fff">
  <span onclick="this.parentElement.style.display='none'" class="closebtn">&times;</span>
 <div class="row">
    <div class="col"><img src="img6.jpg" alt="..." class="img-fluid"></div>
    <div class="col"><h2 style="color:grey;">testo</h2><p>testo testo</p></div>
  </div>
</div>