If you are trying to move a markup to a specific point but it does not land precisely where you want it, most likely you have the Snap function activated.
Revu® for Mac® 2.0
Revu has a number of Snap options that allow you to accurately place markups and measurements on a PDF. However, if you don’t know that one of the options is enabled, your mouse cursor may appear to jump, move unexpectedly, or select the wrong point. There are six buttons in the lower right Status Bar to quickly toggle these settings.
Show Grid : Displays blue grid points on the PDF page, but does not snap to them.
Snap to Grid (Command-Shift-F9): The cursor snaps vertically, horizontally, and diagonally to the nearest grid marker, even when the grid is not displayed. When the icon is highlighted, the snap setting is active. To turn it off, click the Snap to Grid icon until it is no longer highlighted. It is important to note that when displaying the grid, Reuse and Sync do not have snap functionality.
Snap to Content (Command-Shift-F10): The cursor snaps to the underlying content of the PDF. A blue square will display when it is near a point that it will snap to. A square (without the blue fill) will display when the cursor is near an object that it will snap to. For example, the image below shows the cursor when a Length measurement is snapping to a point:
Snap to Markup (Command-Shift-F11): The cursor snaps to other markups in the PDF, just like Snap to Content snaps to PDF content. Also displays horizontal and vertical guidelines that allow you to snap to the horizontal or vertical location of points on other markups, even if they are not currently displayed. Snap to Markup is very useful when creating forms.
Below are a few images demonstrating how Snap to Markup works:
|Snap to a point||Guidelines creating a polygon||Guideline creating aligned rectangles|