WordPress arrows dissapeared strange signs

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Good morning!

I don’t know when but suddenly arrows in plugin “Slider Revolution” dissapeared. It could be only Slider Revolution error but I have noticed that arrow which is used to scroll page to the top also dissapeared and in both there are strange unicode sign “f106”, “E825” ?

Does anybody have any kind of solution to this problem? I have WordPress version 4.9.6.

Here are screenshots and the last from preview:

and how it should be:

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