I found out what seems to happen:
1. I buit a page containing the blog-asset (style is ‘mini’, category is ‘travel’, ‘dmw’). it shows 2 items …
2. 1st item is post ‘dmw’. Posts thumbnail type is image. Posts thumbnail link type is ‘lightbox to the thumb..’
3. 2nd item is post ‘Sideshow post’. Posts thumbnail type is image. Posts thumbnail link type is ‘lightbox to the thumb..’
A click on one of the images displayed by the blog-asset opens the posts thumbnail in a lightbox and the lightbox(-gallery) contains the 2 thumbnails of 2 posts. so everything works as expected.
BUT:
After I changed Post thumbail type of the 2nd post to ‘Slider’ (with 2 images) without deleting the (Singel-)thumbnail first, the lightbox(-gallery) displayed by the blog-asset contains 3 images … so far everything ok … but instead of the 2 (Slider-) thumbnails of the 2nd post it contains the (Single-)thumbnail 2 twice.
… I hope it helps to find the error.
best,
heinetz