UMG Widget animation bug?

I have created a widget that I show it before playing a mission. This widget shows the name of the mission in red color and other information about mission. The fadeIn effect of the animation is played correctly the first time (00:22 video), but not the second time that it’s called (01:03 video).

Is it a bug? maybe something in cache?

00:22 - Display widget and show animation, all ok!
01:03 - Bug displaying again the widget when play the animation

Hmm, in my blueprint I have a Delay function before the animation, if I delete it, the animation works fine. Does anyone know why?