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HTML not loading fine for the first time

Hi people,

Whenever I am loading the HTML for the first time, it is not loading correctly. It is getting kind of squeezed as highlighted in the below mentioned image.
image

But when I reopen it again, the HTML is getting fixed automatically and loading perfectly as highlighted in the below image.
image

This is might be a very small issue but definitely not a good user experience. Attaching the iframe as well .
image

If you can share any ideas to fix this, that would be a great help.

Thanks in advance!