'Export as' resizing fail
I've set up a document with 4 arboards, each containing a produkt mockup. The artboards each measure 3400x3400px, but needs to be exportet in 1000x1000px.
1) I go to File > Export > Export As...

2) I select all (or just one) image, change the format to JPG, change the Image Size Width to 1000px.

3) After a short load the images changes to 1000x1000px, exept for one (the one with a label on it). It changes the height of the image to 1000px and cuts off the width to 600-ish px. When I try to change the width to 1000px again, it keeps this new weird format.

Does anyone know why this is happening? Am I doing something wrong, or is it a bug? My Photoshop is updated and I'm on a 27" iMac.
