Hi, sorry for contact you here, but freshdesk on your site is not working.
I found a bug in UltimateRenko v. 3.21 for MT5, it seems to be t he latest version, and i would report it to you, hope for a fix.

Using indicator, if we do NOT use a preset, and use "reversal open offset" = 0, open price of reversal bar is not the same of close bar of previous bar, i suppose an approximation error. The problem does not happen using presets (e.g. PointO preset).

Can you please check it? Thanks.