This one is rather weird, and hard to reproduce.
If I enter the same latex twice on a page, one of them doesn’t render. I found it happens on longer latex expressions.
Here is an example (it sometimes renders and sometimes doesn’t):
Here is the full text for you:
My latex one:
$$x^2 + y^2 + z^2 + a^2 + b^2 + c^2 + e^2 + f^2 + g^2 + h^2+ h^2$$
end of latex one.
My latex two:
$$x^2 + y^2 + z^2 + a^2 + b^2 + c^2 + e^2 + f^2 + g^2 + h^2+ h^2$$
end of latex two.