When you stand on a flower pot and move, it causes glitchy movement and can sometimes warp you back on top of the flower pot. This also occurs when you jump off flower pots. I've mainly been experiencing this glitch in multiplayer, as I haven't seen any occurrences of this in single player.
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As Alec said, this is a duplicate of MC-1417.
Exactly what has been happening to me. I already reported it, and yes it does not happen on single player.