Why, when flipping slider style to the picture is not immediately applied?

Why, when flipping slider style to the picture is not immediately applied?
joxi.ru/vAWepbi1ZwJpmW
June 14th 19 at 20:43
1 answer
June 14th 19 at 20:45
Solution
Well, if you style the class slick-active slick-current - it is not very good )

Without code is hard to help. Better on codepen , jsfiddle

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