Problem with card render on whole domain - HttpConnectionTimeout

[ilearn.rs]

We have a problem to render card on whole website. There is problem: ERROR: Failed to fetch page due to: HttpConnectionTimeout

e.g. https://www.ilearn.rs/0202004-25/lean-startup

We have in robots.txt:
User-agent: Twitterbot
Disallow:

Thanx in advance

[system]

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