Sales Order Items is copy to Delivery Note Item. but a few second each items rate to change default

Sales Order

In Delivery Note

If you want to maintain same rate then go to the Selling Settings and enable the Maintain Same Rate Throughout Sales Cycle, when creating a delivery note from a sales order then rate will not change.

Thanks @NCP but still reset to default

which version you are using?

Version 14

Everything is working fine. No problems were encountered in the latest version 14. Please check it.

I already but still reset.