Previous comment is basically true, but the randomness can also occur because:
– top code, rendered first, can be an element that displays at the bottom of the page, or anywhere the coder decides it to be.
– webpages these days are full of content outsourced from, usually, more than a dozen of servers. FB scripts, Google scripts, ads, images, specific scripts – each from different server, and their bandwidth or processing speed vary very much.
There more reasons, but those are main ones in my opinion.
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