Navigation arrows stay with "on click" style

[NolwennMely]

Device: iPad mini
System: ios 6.1.3
Browser: Safari and Chrome

Scenario:
1/ Connecting on my photos with at least one album available
2/ Clic on one album with at least three pictures
3/ Clic on first picture
4/ Clic on the right arrow

Expected:
Second picture is shown and right arrow comes back to normal style

Actual behavior:
Second picture is shown but right arrow remains in "on click" format. (Even after clicking again on it or on somewhere else on the screen)

Note:
Right arrow comes back to normal style only once we click on left arrow. (Which then becomes the arrow that keeps the "on click" style

[NolwennMely]

When I'm on a picture view and I click on "fermer" then on the thumbnails view of the album the button "retour" has "on click" style.