Fullpage.js not working when adding a new section - fullpage.js

Question

I was using with no problems fullpage.js when a strange thing happened. I add a section to my page (it was 4 slides, i added a new slide) and fullpage seems not to work anymore.
I tried this code https://codepen.io/alvarotrigo/pen/eNLBXo in a new page and even this doesn't work. This is the code i used to set up my page and online i can add a new section without problems. So i think the problem should be somewhere else.
<div id="enlabs">
<div class="section testo">
LUISS Enlabs è un ecosistema animato da una community in continua evoluzione, è il luogo ideale per trasformare ogni startup digitale in una realtà d’impresa, crea opportunità uniche per
gli investitori. La capacità di avere una visione è il focus del nostro progetto. Con un approccio retrofuturistico abbiamo attinto da un repertorio di immagini che richiama gli anni ’50
e ’60 del secolo scorso, un momento storico in cui grazie al boom economico e ai primi viaggi nello spazio si guardava con grande ottimismo alla tecnologia e al futuro.
</div>
<div class="section">
<div class="slide fullscreen">
<picture><source data-srcset="https://www.spazio.studio/wp-content/uploads/2019/img_nuove/enlabs/SPST_enl_01_low.jpg" media="(max-width: 500px)"> <source data-srcset=
"https://www.spazio.studio/wp-content/uploads/2019/img_nuove/enlabs/SPST_enl_01_low.jpg" media="(max-width: 800px)"><img class="full-bleed-img lazyload" data-sizes="auto" data-src=
"https://www.spazio.studio/wp-content/uploads/2019/img_nuove/enlabs/SPST_enl_01_low.jpg"></picture>
</div>
</div>
<div class="section">
<div class="bordered" style="background-image:url(http://www.spazio.studio/wp-content/uploads/2019/img_nuove/cmp_img_017.jpg)">
</div>
</div>
<div class="section">
Four
</div>
<div class="section">
Five
</div>
</div>
<script async src='https://www.spazio.studio/wp-content/uploads/lazysizes.min.js'>
</script>
<script src='https://www.spazio.studio/wp-content/uploads/easings.min.js'>
</script>
<script src='https://www.spazio.studio/wp-content/uploads/scrolloverflow.min.js'>
</script>
<script src='https://www.spazio.studio/wp-content/uploads/fullpage.js'>
</script>
<script src='https://www.spazio.studio/wp-content/uploads/jquery-3.2.1.js'>
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
</body>
</html>
<script>
new fullpage('#enlabs', {
anchors: ['page1', 'page2', 'page3', 'page4', 'page5'],
sectionsColor: ['white', 'white', '#FFF', '#ADD8E6', '#ADD8E6'],
autoScrolling: true,
css3: true,
lazyLoading: true,
scrollOverflow: false,
lockAnchors: true,
});
</script>
I see page progress in navbar but browser window is white.