cuts off start of ringtone

Hello Pmg1173,

We would like to see how we can help you with your custom ringtone. Are you following the steps in this link to create that ringtone: Create a ringtone of your Logic Pro or GarageBand for Mac song - Apple Support

"Share your project

1. On your Mac, open the project in Logic Pro or GarageBand.
2. Share it to GarageBand for iOS:

• In GarageBand, choose Share > Project to GarageBand for iOS. 
• In Logic Pro, choose File > Share > Project to GarageBand for iOS.

3.Select the "GarageBand for iOS" folder in iCloud Drive, then click Save.

Export the project as a ringtone

1. Open GarageBand on your iPhone, iPad, or iPod touch.
2. In the My Songs browser, tap Browse , tap Select, then tap the project you shared from your Mac.
3. Tap , then tap Ringtone.
4. Enter a name for the ringtone, then tap Export. If the ringtone is longer than 30 seconds, tap Continue to have GarageBand shorten the ringtone automatically. Or, tap Cancel to return to the song so you can shorten it.
5. Tap Export.
6. When the ringtone is finished exporting, you can assign the ringtone."

If so, and the issue persists, reach out to Apple directly at: Get Support - Apple

Cheers!