Wait, clarify how that would cause issues.

I've been trying to re-UV some L4D1 zombie face models, however I have issues with Source Tools incorrectly exporting their facial flexes, causing noticeable weirdness with their faces.

Here is why I think it is Blender Source Tools:
- The source SMD of the zombie face compiles correctly, without any issues.
- When just importing/exporting the same SMD, the issues reappear on the exported SMD.
Other notes:
- The mesh does not appear to be the issue, as in-editor I make no modifications to it.
- I have been attempting to avoid moving the mesh around the bones to any extent, and have succeeded. However, despite this, there are still facial issues (with some improvement).
- I cannot preview animations in Blender as the bone setup for the facial animations do not include the rest of the skeleton and tend to produce even worse results when loaded.

Images:
Uncompiled (more functional mesh):
https://cdn.discordapp.com/attachments/465606485808775169/467774004288028683/unknown.png
https://cdn.discordapp.com/attachments/465606485808775169/467774082620981258/unknown.png
https://cdn.discordapp.com/attachments/465606485808775169/467774149817794560/unknown.png
Compiled (improper) mesh:
https://cdn.discordapp.com/attachments/465606485808775169/467770302705958912/Desktop_7-14-2018_12-11-56_PM-629.png
https://cdn.discordapp.com/attachments/465606485808775169/467770313036267521/Desktop_7-14-2018_12-11-52_PM-55.png
(slightly older):
https://cdn.discordapp.com/attachments/465606485808775169/467770354681511936/Desktop_7-11-2018_1-55-09_PM-256.png

Download (includes original decomp SMD, latest blend for comparison):
https://drive.google.com/file/d/1RnNeoi7MheRGaOCsxanqVtEhhb7FkQzD/view?usp=sharing