Yes. ClickGuard tracks both IPv4 and IPv6 addresses.

Does ClickGuard ever represent IPv6 as IPv4?

No. While there are systems that will "convert" IPv6 addresses to IPv4 (actually transform them into a lower-capacity address space), ClickGuard always shows IP addresses in their full form.

Systems that show IPv6 addresses as IPv4 actually lose information as the IPv4 address they are showing is an address of a hosting node that operates within the IPv6 address space meaning a single IPv4 address shown by the system in question can actually represent millions of different IPv6 addresses.