I have one more possible guess of what might be causing that, but I'm not completely sure. On the “Grand festival..” page the “swan of your heart” text appears within a text which is inside shortcode brackets [ … swan of your heart …]. My guess is that before this text is passed to the context finder, it might be mistakenly ignored as a shortcode, at least this could explain that.
To resolve this, can you try changing the following option: https://i.imgur.com/RnNDCtK.png
I have a feeling this will resolve that for all cases.
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