I Gave 60 Day Notice Of My Move Out Date At The End Of My Lease, Now The Portal Says I'm Going Month To Month Since I Didn't Fill A Paper

Help? I was filling out paperwork to sign a lease at another apartment and noticed my future charges in the portal were 2k+ next month. My move out date is halfway through next month and when they offered lease renewals in January I selected the drop down option online to not renew, they emailed me asking for the move out date and I responded with the date.

The wording in their email "To finalize your move-out, please reply to this message with your expected move-out date. Once we have that information, we'll send you our Notice of Intent to Vacate form, which will detail any outstanding balance before your departure. We cannot process your notice until we receive your move-out date."

I didn't fill out that specific form and found it again yesterday and it says "Please note that your notice to vacate will not be considered valid until this form has been completed and signed by management."

I'm now worried they didn't input my notice even though on the front page of the portal it says "Lease ending is up for renewal. DECISION Move out (insert move out date)". Would I be held liable if they refused to accept the move out date I said and I just moved out?