If your lights are drawing power as a load running from that GFCI device, then you still have a problem.
You need to consult an electrician. You are working with something that can burn your house down.
Irregardless of whether or not that ballast was bad. There are electrical codes that specifiy how and under what conditions a GFCI may provide power to loads down circuit. If your place burns down becasue of it, I can guarantee you that your homeowner's policy will not pay if you did the work and did not have it inspected by the building inspector.
Not a rant, I just don't want you getting in trouble of having any fires.
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+++++++++++Boom!
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