Well Barperiod = 1440 is wrong. Renko bars have no daily granularity. The manual has a chapter on special bars and there is also mentioned how you must set the bar period.
https://manual.zorro-project.com/bar.htm The prices of some special bars are artificial but I believe renko bars have the real prices. So I dont know the problem with your prices but if you need help in detail you can get a support ticket and contact Support.
