Only ONE highlight per note takes effect

I am using Joplin for the desktop v1.3.18 Sync version 2, Profile version 34.
My OS Linux Mint

Noticed an odd behavior:
when highlighting in my notes (using ==highlight== ), i can only highlight one contiguous phrase in the entire note. IF if add another sentence further away from the first highlight, then Joplin un-highlights the first and does the last one.

Is it a bug or my misunderstanding of the "==" operator?

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