System Information
Operating system: Windows-7-6.1.7600-SP0 64 Bits
Graphics card: llvmpipe (LLVM 8.0, 128 bits) VMware, Inc. 3.3 (Core Profile) Mesa 20.0.1

Blender Version
Broken: version: 2.83.1, branch: master, commit date: 2020-06-25 09:47, hash: rB8289fc688b3e
Worked: (newest version of Blender that worked as expected)

Short description of error
bad selection in edit mode , bad cloth simulation, bad shading in cycles, not moving object only the origin.

Exact steps for others to reproduce the error
this happened for first time using this new b3d version today...
the cloth mesh was created with a addon called flexi bezier tool, and i realized that some problems started when drawing, and after i convert the curves into mesh.
1- select cloth mesh, go to edit mode, box select,circle select doesn't select the vertices,edges,face in the mouse position properly, its like "shifting" or "avoiding" to select precisely, i try to move the mouse and select a little bit more above of the selection (for example up z axis) and gets selected what i wanted to select but still selects inappropriately anyways...the same happens when i try i to add a loop cut, the yellow edge loop indicator appears out of place...

2- i try to move,rotate,scale in object mode (cloth mesh) but doesn't scale and rotates, but i only realized that origin only moves (and is not enabled origin option in the upper toolbar to be able to move the origin in the other manner its only moving the orange dot, and also there are not visible transform constraints in the panel that cant prevent to be move/scale/rotate)
but in edit mode is working scale,move,rotate funtions...

3- i try shift+z to render in cycles, appears bad shadows or some kind of duplicate of the mesh (cloth mesh) in the rendering (viewport)

4-i try cloth simulation without changing the settings very much (i enabled sewing for example, set object collision and self collision to a very low margin, edit the stiffness), i run the simulation but appears badly misaligned and shrinkwraped to the target mesh (girl model), but i supposedly made the cloth mesh very workable for simulation, so the prolblem its something else...
please check the blend file for more digging into the bug...thanks in advance and take care guys....