Yes, it is a normal email from TurboTax. When you sign up for the Refund Processing Fee, the agreement is that if your refund is delayed or you have an offset, TurboTax will take the fees from your bank account. See the following
Why was my bank account auto-debited for TurboTax fees?
When you filed your 2018 tax return, you chose Pay With My Refund, which lets you deduct your TurboTax fees from your IRS tax refund instead of paying them with a credit or debit card.
Per the Refund Processing Agreement, you authorized us to debit your bank account if your refund was insufficient to cover your fees:
In addition, by clicking the "I Agree" button below, you electronically sign and authorize Intuit (through its third party processor) to debit the TurboTax Fees, Additional Products and Services Purchased and any applicable sales tax from your bank account number identified in the Agreement below, in the event that you do not receive a tax refund that is sufficient to pay for them.
Before we debited your account, you would have received 4 emails from us:
You can also be auto-debited if you signed up for Pay With My Refund and your refund is sufficient, but the IRS is still holding your refund 36 days after your original estimated refund date. In this case, you'll get the same email notifications from us, except we will debit the Pay With My Refund fee (if any) in addition to your other TurboTax fees.