This issue was originally noticed back in July but was not reported as a bug.
The problem seems to stem from defining a VC Percent type column when the values used in the calc the value are of Number type.
VC Percent column = Number1 / Number2
When entering or editing a row, the VC column calculates the value correctly. Once saved and a Sync is performed, The VC column reverts to 0.00%.
Editing row and immediately after Save, Percentage Value is correct.
After Sync, the Percent value reverts to 0.00%