This may be a bug OR performance issue. Please test Tempest Rush and fix.
EDIT: Players, please Thumbs Up this thread to get it the attention it deserves and respond with a confirmation this happens for you: https://us.battle.net/d3/en/forum/topic/6794212778
HOW TO REPEAT THE TEMPEST RUSH RUBBERBAND
1) Use Tailwind rune
2) stand in any ground effect damage dealer while using Fists of Thunder|thunderclap on an enemy
3) try to tempest rush to safety
4) repeat until rubberbanding happens. should not take many repeat attempts