Do I have to pay if I'm already over?

I am no longer a W2 employee since I left my teaching job in August.  I'm now doing contract work.  When I use the tax calculators from you or the IRS to estimate based on what I think I'm going to earn the rest of the year it says I've already contributed over the amount I will owe.  Do I still have to pay estimated quarterly taxes if I've already contributed what I'm going to owe for the year?

 

I have a side W2 gig that I have extra taxes withheld from.  I'm making less money from this job now too but still paying the same in taxes.  I think that is why the calculators say I've already contributed what I'm going to owe in taxes this year.

 

Please help, my situation seems confusing!