Table: Fixed shaking table.

src/utils/popper.js

@@ -180,7 +180,7 @@
 
         // make sure to apply the popper position before any computation
         this.state.position = this._getPosition(this._popper, this._reference);
-        setStyle(this._popper, { position: this.state.position});
+        setStyle(this._popper, { position: this.state.position, top: 0 });
 
         // fire the first update to position the popper in the right place
         this.update();