Synced values with ‘&’ character are being replaced with special characters

In UnitiySync, character replacement is performed on certain character sets to allow literal characters to be used in map files.

You can disable these Character Replacements if necessary.
Assuming you have not added any Custom Mappings that puposefully utilize any of available Literal Replacements outlined, you may disable the replacement function to avoid unwanted replacements of incoming character sets. To do this, you will modify the config.txt file for the connection, adding a new paramter, map-literal=no.

Select your connection. Go to the Custom Tab. Click Raw Config.
Add the following parameter and click Save.
 map-literal=no

As of version 4.1.0, the Literal Mapping method has been modified in order to avoid this problem all together (without the use of map-literal). The new default Literal Character Replacements are outlined here: Literal Character Replacements as of v4.1 .