Hi @Hans Fast ,
I have encountered that before as well, and it seems to happen when too close to a macro. I like that you already tried more specific text. Alternatively, have you tried to highlight the "Product Management" header in the line above your paragraph, instead?
If that still doesn't work - I would recommend submitting a bug to Atlassian - or using the "Feedback" option in the lower right when editing (bc it looks like that might be on the new editor). I do feel like I encounter this more in the new editor than the old, but its hard to say for sure.
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