can polarized capacitors be used in an active crossover circuit

Hello, I'm planning on making an active crossover for my 3-way sound system.I'm using mh-audio.nl's active low-pass filter calculator.
The image below is what I received.

My question is:
Why are two polarized capacitors shown on this schematic?

According to what I know, these capacitors are supposed to be non-polarized. Is there something wrong with this schematic?
Thank you all.

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