Lightbox works randomly on a gallery or not

[LouBen3010]

Hey there,
I have a curious issue. Today I created 20 galleries and at first sight the worked fine.
But as I checked some pictures I found out, that the lightbox randomly will not work.
All settings are the same:
-Approx. 150 pictures
-2MB picture size

Is the bug already known?

Have a nice day
Benedikt

[Author]

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