I need to relocate my water heater to another location. So on
Saturday I disconnected my water heater.

I first turned off the power to it, then I disconnected the wiring.
Then I flipped the "hissing" valve on top, connected a garden hose to
the bottom drain and let it drained out.

Next I needed to turn the water supply off. There was a gate valve
right there and I turned - it broke off - all corroded and the stem
just broke. So I went and shut off the main water valve, then
disconnected the water supply.

Next is the hot water feed that comes out of the heater. I removed
that too, and some water came out, as expected.

After the water heater was drained I moved it out of the way.

Next I cut off the water supply and capped it with a 3/4" sharkbite
end stop. I then turned the main water back on. Everything should be
ok right?

No...now water came out of the hot water line that was connected to
the heater. That line is supposed to be fed by the water heater and
now is not even under pressure, so where is the water coming from?
This water is not under pressure but it's slowly pouring out of the
line.

I understand the hot water and cold water lines are supposed to be
disconnected, the only connection is through the hot water heater
which is now disconnected. So why do I have water coming out? Unless
there is another "cross over" from the cold water line? The fact that
this hot water line is no longer under pressure, is causing water from
somewhere else to be drawn in?

I don't think this is normal, or is it? HELP...Thanks in advance.