I had to amend my taxes because I made a mistake. Does that take a while to register in the system? It is still saying my previous return amount instead of the new one.

[VolvoGirl]

In which system?  At the IRS?  You will still get the first original full refund (and keep it) or need to pay the first tax due. You should not amend or change your return until you get the refund from the original return or your payment has cleared.

Normally amended returns take 16 weeks (4 months) to process. 3 weeks after filing you can check an amended return here.
https://www.irs.gov/filing/wheres-my-amended-return

Mailed Amended returns can take 6 months or more.
https://www.irs.gov/filing/wheres-my-amended-return

[DoninGA]

How did you try and amend the tax return?

You will have to wait for the IRS to either Accept or Reject your filed federal tax return.
If the return is rejected you can make the necessary changes and e-file again.
If the return is accepted you will have to amend your original tax return. An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 20 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...