Sales Invoices, single price under 1€

Hello, if i make a new invoice an have a single price under 1€ e.g. like 0,15€ or something it show me in total price 15€.
I have never seen this before, is it a bug? My Version 16.10.55, and Version 16.10.86

Check your number format under Preferences. You may have chosen a format for which the comma is not the decimal indicator.

Thx Tut, i have choose a different format and ist works.