Back-end info in portfolio slider

Hello, before you explained how I could integrate yoast SEO in a correct way. I followed every step and it worked. BUT now I see that some unwanted info appears in the portfolio slider: https://tuinarchitect.bertbreugelmans.be/projecten/natuurlijke-tuin-niel/

You have to refresh until you see 'bedrijfstuin - Mechelen' in one of the three pictures below in the portfolio slider. You'll see the following info is showing underneath: title MECHELEN no-repeat;left top;;auto title natuurlijke bedrijfstuin – 12×6 no-repeat;left top;;auto copyTot 2 jaar geleden was dit een gebetonneerd stukje binnenstad in Mechelen. Vandaag is deze […]

How can I avoid this?

Thanks

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