Task without subtasks moves away from the cursor while moving in the timeline

FNC TMS FNC Gantt Chart
1

We are using FNC Gantt Chart 1.2.3.4.
If you move a task without subtasks in the timeline, the task length is kept, but it moves away from the cursor with every weekend it crosses.

2

We're still checking on how to fix this issue, but we are working on this.