generated images

Hello akyusa,
I don´t have a login, so I can´t get a ticket.
I tried different things now.
After changing the image dimension for the gallery, it will load the set dimension (e.g. 320px) put it will still also load the 1280px file. It´s loading both (what I can see in the browser web information).
If I change the image dimensions for the lightbox picture, nothing will change.
After playing around with the image dimensions for the gallery and the lightbox, surprisingly it generated another image file with 1920px size. Now its always loading the 1920px size file besides the 320px file. Remember I just uploaded a 960px file. It´s generating judge files.

Does it´s always loading 2 files for one picture (or 3 if thumbnails are activated)? One for gallery grid preview and one for lightbox?
It looks like it´s loading the wrong picture for the lightbox. Even if I set dimension to “default”, it should use original file size (960px) and also if I set a different dimension like 800px, it will always loading the 1280px file and now even the 1920px file.

Maybe it is confused because of the retina display and trying to create a bigger file for the resolution?

After this I created a completely new gallery to do some more tests.
I set the image dimensions to “default” or to a different one like 400px for grid and 800px for lightbox (makes no differences if set to default or 800px). I uploaded some completely new pictures. I took a look with webFTP and saw that just the normal pictures were created from wordpress.
After I published the gallery and loaded the website with the gallery, it created a new 1280px image file and used this one, instead of the default=960px or 800px. It´s also loading again both, the 400px (I think the grid image, which is set to 400px, so it´s correctly) and the 1280px (I think the wrong lightbox image maybe).

I hope someone can help me to fix this issue or can tell me what I´m doing wrong.
Thanks a lot.