(this is just a single example, but reported bug appears in case of virtually every article that has some images)

Steps to Reproduce:

1. Open Wikipedia app.
2. Navigate to any article that links to Häme Castle in English language (i.e. "Hämeenlinna" article)
3. Tap link to open article preview / article overlay
4. Notice order of photos in preview: long distance view (A), old photograph (B) and close-up of castle (C)
5. Remember order of photos (A, B, C), their count (3) and notice that each of them appears only once in article preview / article overlay
6. Tap any of images in preview
7. Slide right and left to see count and order of images in image preview / browser

Actual Results:

Scenario 1 (tap the first image -- A):

• There are 4 images instead of 3
• Order of images is A, C, B, A
• Image A is doubled

Scenario 2 (tap the middle image -- B):

• There are 4 images instead of 3
• Order of images is B, C, B, A
• Image B is doubled

Scenario 3 (tap the last image -- C):

• There are 4 images instead of 3
• Order of images is C, C, B, A
• Image C is doubled

Summary:

• Tapped image is always doubled
• Its copy is show always as first
• Order of images is inverted

Expected Results (in all scenarios):

• There are always 3 images, matching in image preview number of images from underlying article preview
• Order of images is the same in image preview as in article preview: A, B, C.
• No image is doubled