Thank you for the question.
RadPictureRotatorHubTile and RadMosaicHubTile share the same behavior. They take random pictures from the source collection. This means that the smaller your image collection is, the greater the chance that the same picture will be displayed twice or more times in a row. This behavior is the same as the system tile of the Pictures app on the Phone's home screen.
Please write again if you have other questions.
the Telerik team
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