My Twitter Cards have stopped working only for the main URL or domain

[MASmusculo_Timo]

Issue: The Twitter Card from my domain have stopped working only for the main URL or domain.

URL affected: masmusculofalsificaciones.com

Troubleshooting steps tried already:

The Card validator show me:

*.masmusculofalsificaciones.com is whitelisted for summary_large_image card

Log
INFO: Page fetched successfully
INFO: 15 metatags were found
INFO: twitter:card = summary_large_image tag found
INFO: Card loaded successfully

My blog have not robot.txt.
The hot link protection from cloudflare is disable.

Example tweet with problem with TWCards: https://twitter.com/MASmusculo_Timo/status/749037877519085568

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Instead, for other post of my blog with URLs internal, the Twitter Card are displayed correctly

Example tweet with TWCard work fine: https://twitter.com/MASmusculo_Timo/status/859064298827644928

Please advise
Thanks!

[andypiper]

It looks like the page has og:image set to https://s0.wp.com/i/blank.jpg (which I think is the default when the Wordpress Jetpack plugin cannot find any other image to use on the page). You should fix that tag or add a twitter:image tag to override it.

[MASmusculo_Timo]

According yours recommendations, I have disabled the WP Jetpack Plugin and now the Twitter Cards work fine!

Thank you very much!

[andypiper]