CAPTCHA challenge not displaying on a news website when trying to post a comment

On a news website hr.n1info.com/ you are requiered to solve a simple math question but image of a math question is not displaying when using tor Browser. I confirmed that this is not caused by a website blocking Tor by configurning ordinary Firefox browser to use Tor which displayed the math question.

Here are some examples:

hr.n1info.com/a190014/Vijesti/Dobavljaci-U-ponedjeljak-ocekujemo-razgovor-s-povjerenikom.html

Tor Browser:

i.imgur.com/R64fSYt.png

Firefox conhjfigure to use Tor:

i.imgur.com/z3W12rR.png

Trac:
Username: laurus

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