The backslash deleted

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Hello
I just installed the current version of anspress.
I have a problem: the backslash \ used in latex code  are delted in the comments (something that doesn’t happen in the questions). This is an example:
If I send :

\frac{x}{y} + \sum_{k=1}^n a_k


it becomes:

frac{x}{y} + sum_{k=1}^n a_k


that is to say without the backslashes.
Thank you for helping me overcome this problem.

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