The contact in question had the wrong phone number in Viber, so I deleted it from Viber. I later found out that Viber had deleted it from my contacts, so I had lost all of the other correct information.
Logging in to GMail contacts on the desktop showed that the contact still existed. I proceeded to correct the faulty phone number and tried to sync my contacts from my phone, but this particular contact never shows up.
Is there any way around this?