Adding to this, OP used only Hondew berries, so only SpAtk EVs were removed. As an ingame Sceptile, it's likely it has random amounts of EV in all stats, so one would need to feed all EV reducing berries to obtain a clean slate.
Otherwise, like Fizz mentioned, if Sceptile only had 10 SpAtk EVs that were deleted, only 10 Atk EVs would be added, because the rest 500 EVs are invested in HP/Defense/SpD/Speed.