Round (normal) opening and closing brackets are different in writer's formulas

asked 2015-12-11 11:45:03 +0100

I just noticed that the opening and closing brackets in mathematical formulars are different. Typing (1) in the formula editor gives this result:

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What is kind of interesting, using a "3" results in an equal sign:

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What am I doing wrong? I created a new document, without changing any settings.

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