Bug with swapping items

[rychagov]

https://stackblitz.com/edit/stackblitz-angular-gridster2-bug-ymn1em4z?file=src%2Fgrid%2Fgrid.component.ts

Try to move the element that is below the first two higher.
Expected behavior: the element took a new place, the others moved lower.
Actual behavior: the element took a new place, but at the moment of dragging, the mutual position of the first two elements changed. At the same time, if you move the element very quickly, one of the first two elements will jump approximately to the place of the element that we are moving.

If change compactType: CompactType.CompactUp to compactType: CompactType.CompactDown then the same behabior appears when item moved lower.

P.S. Unexpected behavior when:
using compact type, e.g. CompactType.CompactUp + swap false + pushItems true = impossilbe to move items upper