{solved} Need some help on floating fingernails issue

Hi. The right side of the body must move and morph independently from the left side, so when you mirror something, you must also re-do rigging and uv_1.
Using mirror modifiers is not a good idea because it does not change vertex groups' names to the opposite (it can but not with how maxis vertex groups are named). It flips uvs off center as well.

So you do it like this:
- delete the nails on the right side of the body;
- Remove unused vertex group from the mesh with this addon ( enter 0 and click on purchase, in Blender go to File - user preference, switch to addons, choose install from file, choose this file);
- in object mode select the mesh and press Shift D, then Esc to duplicate;
- rename every vertex group from the left to the right, so from b__L_Thumb0__ to b__R_Thumb0__;
- select uv_1, in Uv editor change Pivot to 2d cursor. Select everything. The cursor should be at 0,0 coordinates by default, if you did not move it, UVs - mirror - x axis;
- in object mode select the duplicate, shift- select the original, (in this order!!) join with Ctrl J.