Vanishing slideshow images after deleting one slide

Hi Webflow Forum!

I don’t understand why this is happening but I was hoping someone could explain this to me.

I have a Slider with Lightboxes in the Slides and a Div block. (Originally I was using a Image block instead of a Div block, and now I am replacing the Image blocks).

Everything is going predictably well but then occasionally when I delete the Image block inside the slider, to put in a Div block, every Slide seems to vanish!

So far my work around has been to copy a Slide that was successfully changed and then replace the div block.however I don’t understand why this happens.
Can anyone explain this to me?

Here is a link to page that has my slider issue, hopefully this is clear…