Slides little bit stuck after one and other

Hi Support!

I would like to ask for your help regarding the slides I have on my site's main page (both on the Hungarian and English page) 

I set 5 seconds between my slides, I noticed some days ago that the slides don't disappear properly, like one is still there a little bit, while the next one comes. It's pretty strange. I don't think that it's caused by any CSS code as right after inserting a new code this issue was nowhere. I have contacted the Squarespace support, they are also investigating on this matter. Have you ever encountered such an issue? Could you please advise/help? 

Your support is very much appreciated. 

Kind regards, 

Viki 

It has been solved by the help of the support.

The site animation's settings has been modified from None to Fade in.