Could you please give us some code snippets or a project that reproduces this issue so that we could examine the problem? Also some pics or a video demonstrating the issue would be highly appreciated.
I have an assumption on what may cause your problem- if you're using RadFluidContentControl (or a RadTransitionControl) and the content that you're animation is not visible at the moment (your tileViewItems are small) you may see some colored vertical lines during the animations. You can fix this by enlarging your items or by turning off the transition for this animation.
We look forward to hearing from you.
All the best,
the Telerik team
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