These are the breath bubbles from the FatReduction UI.
The breath window is not movable. By default it appears in the center of the screen. If you want to move it elsewhere, you will need to:
Edit your .ini file.
OR
Move the breath meter to the desired location before installing this mod.
OR
Change the Style_Border tag to true (<Style_Border>true</Style_Border>) in EQUI_BreathWindow.xml long enough to move the window.