Hover effect of image does not apply

Greetings, I’m working on doing a background hover image, but I do not know what happens in the browser preview the image remains static:

does not effect applied

the strange thing is that in the preview of the application the image is not displayed:

clarified, that effect I have used previously in other pages with blocsapp and work perfectly, also the hover with colors looks perfect but with the background images is not applied as such.

The same mentioned that update the application yesterday that was released version 2.5.2