captcha not working with FF55.0.3

Firefox seems to have some problems with captcha.

According to the following website, there seems to be a coding issue on the XN website that is subject to that glitch.

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This is a well-known issue caused by misusing the <label> element. Make sure you are using it correctly. 

This is good:

[captchac your-captcha]
<label>Enter the code: [captchar your-captcha]</label>


This will not work correctly:

<label>[captchac your-captcha]
Enter the code: [captchar your-captcha]</label>