im building my own website but my theme create a blank block - html

I'm building my own website and I've forced to stop because in my preview I found this blank block.
I'm building site on wordpress using Unfold Theme.
Anyone know how I can delete all this block??
I circle with red in the follow image :
enter image description here
I tried to check theme editor and tried to found specific block and deleted it but nothing worked.
I hope someone can help me deleting all blank block
second try for the image
blank block image
i can add an example of code that i found checking site:
<div id="sp-zxjk1v" class="sp-el-col sp-w-full" style="width: calc(33,3333% - 0px);">
<pre></pre>
when i inspect page, the code
<pre></pre>
show the blank block

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I think you forget to close any tag in your site. Most probably it is problem of javascript. so, remove one by one javascript and check this out...