Transparency got lost on your images

If you are using images within sliders, which have transparent parts, and these parts become black, white or some other not-transparent color, then your problem will be caused by the Optimize tab's Convert to WebP or Resize option. These are recreating your images, but already optimized images can have issues, like this transparency loss, so you should try to turn off these options, to see if they resolve your problem.

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