css flexbox image size strangely changing

Question

I started testing Flexbox using on an existing template from an older stackoverflow question

HTML

.flex-items {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 100%;
}

.kutu {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

<section class="team ">
  <header class="exp">

  </header>
  <div class="flex-items">

    <div class="kutu">
      <h2>Temsilci</h2>

      <div>
        <img src="/images/ben.png" alt="">
        <h4>Umutcan <span class="text-primary">"ııııııııııııığ"</span> Adiguzel</h4>
      </div>

      <div>
        <img src="/images/kaan.png" alt="">
        <h4>Ahmet Kaan <span class="text-primary">"kargolar seffaf mi"</span> Aslan</h4>
      </div>

    </div>

    <div class="kutu">
      <h2>Bas kole</h2>

      <div>
        <img src="" alt="">
        <h4>Ismail Emre <span class="text-primary">"Emre"</span> Gunes</h4>
      </div>

    </div>

    <div class="kutu">
      <h2>Avusturya Temsilcisi</h2>

      <div>
        <img src="" alt="">
        <h4>Hayri Cem <span class="text-primary">"hayry"</span> Adiguzel</h4>
      </div>

    </div>

    <div class="kutu">
      <h2>Avcilar Yonetim Birligi Uyesi</h2>

      <div>
        <img src="" alt="">
        <h4>Mehmet Ali <span class="text-primary">"ali58"</span> Kuzu</h4>
      </div>

      <div>
        <img src="" alt="">
        <h4>Anil <span class="text-primary">"anil"</span> Akyil</h4>
      </div>

    </div>

    <div class="kutu">
      <h2>Eskortlar Odasi Esbaskan Vekili</h2>

      <div>
        <img src="/images/burak.png" alt="">
        <h4>Burak <span class="text-primary">"yarrak gurmesi ekmen"</span> Colakoglu</h4>
      </div>

    </div>

    <div class="kutu">
      <h2>Lezbiyen Haklari Koruma Birligi Uyesi</h2>

      <div>
        <img src="" alt="">
        <h4>Ugur <span class="text-primary">"bardo"</span> Yengil</h4>
      </div>

      <div>
        <img src="/images/cenker.png" alt="">
        <h4>Cenker <span class="text-primary">"ceko anılelifbarışsınoğulları31"</span> Goksu</h4>
      </div>

      <div>
        <img src="/images/canemir.png" alt="">
        <h4>Canemir <span class="text-primary">"Gay Emir"</span> Ozdemir</h4>
      </div>

      <div>
        <img src="/images/denizbora.png" alt="">
        <h4>Deniz Bora <span class="text-primary">"dbe"</span> Ekiz</h4>
      </div>

      <div>
        <img src="/images/kutay.png" alt="">
        <h4>Mehmet Kutay <span class="text-primary">"kutii"</span> Keklik</h4>
      </div>

      <div>
        <img src="/images/gokdeniz.png" alt="">
        <h4>gokdeniz <span class="text-primary">"anıllaelifevlensin"</span> Dincer</h4>
      </div>

    </div>

    <div class="kutu">
      <h2>Kaymakam Kalem Muduru</h2>

      <div>
        <img src="/images/ilker.png" alt="">
        <h4>Ilker <span class="text-primary">"aktif gay"</span> Tari</h4>
      </div>

    </div>

    <div class="kutu">
      <h2>Muhtarlar</h2>

      <div>
        <img src="" alt="">
        <h4>Muhammed Can <span class="text-primary">"s2m2m7"</span> Adiguzel</h4>`enter code here`
      </div>

      <div>
        <img src="" alt="">
        <h4>Metehan <span class="text-primary">"Its mother fucking ghost"</span> Adiguzel</h4>
      </div>

      <div>
        <img src="" alt="">
        <h4>Enes <span class="text-primary">"Suprise"</span> Adiguzel</h4>
      </div>

    </div>









  </div>
</section>

CSS flexbox image size strangely changing I would be grateful if you could help