I have been noticing this when I was adding lines to my today's open and yesterday's close. I saw that when today's open and yesterday's close has been highlighted two times, the support or resistance is stronger than ever. Take a look.
I'll be honest, i'm not use to a OLHC bar chart so i don't know exactly what i'm looking at on your chart. But here's my 2 cents. As price hovers around support or resistance, it'll typically close and head away from the S&R...so the next open = the close. Where this close provides S&R...but since close = open...it's basically the same thing.