Thanks for explaining that. I was so confused about that, it reminded me of gaelic where no word sounds as it's spelled.
The reason for that is because the Latin alphabet doesn't encompass a lot of the sounds made in Gaelic, since it was so linguistically isolated during its creation.
Please, report it in the "report section" instead. Everyone agrees with you.
Salve = singular greeting. Salvete = plural greeting.
"Hi to you alone" = Salve. (French: salut à toi, salut à vous)
"Hi to you all" = Salvete. (French: salut à vous tous)