Problem with code tag

[Rulaman]

Hi,

I encountered a problem with the code tag (in preview mode)

It is very ugly.

Code: ags

This is code.

This i bearly readable.

Posted as image to show what I mean.
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https://i.postimg.cc/SKVdtwdp/code-tag.png
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[Crimson Wizard]

I have this "white on transparent" happen sometimes too right after I post or edit a post. After I refresh the page, it gets fixed (most of the time).