Antifreeze -how did it get there? UPDATE

[rogue]

From your two posts, it sounds like the fill tank and the winterguard lines are reversed.
What I thought you said was
1) when you used the winterguard connection and put the hose in the antifreeze, it went into the fresh water tank.
2) When you connected the antifreeze to the city water connection an switched the lever to fill tank, the anitfreeze went into the lines and not the tank.
If correct, sure sounds like the two are reversed.