Hi,
From what I can see, this option is to send the detailed data about the order to the payment gateway.
If you don't need the detailed data, you can keep that option turned off.
It's likely that you're in a specific case of use, with elements in the order not handled properly by the developer of the plugin, which leads to the payment gateway not able to match with the total amount.
So this will require the developer of the plugin to investigate the situation and modify the code of the plugin to properly support your situation. From what I can see, this plugin is developed by the payment gateway, Tinkoff. So you'll have to contact their tech support directly to report the issue to them.