Something funky going on here:
Using the newest Chrome version
https://bitcoinwisdom.com/markets/poloniex/drkbtcit seems to not refresh/clear the drawing surface as often as it should, because sometimes it gets re-drawn correct after a few seconds.
Am I the only one that experiences rendering issues? chrome (38.0.2125.104 m) win8.1

This has been going on for a while now. It may have started after I installed win8.1, but I'm not sure...
Doesn't happen in Firefox, but the chart is slow as hell there...
I've created a small script to test the compatible.
http://jsfiddle.net/x1ny28bh/1/Open the link and click 'ClearByAssign' or 'ClearByClearRect' in right-bottom, to check if the rectangle cleared or not.
This works in chrome. I believe it may be a combo of chrome and win 8.1 as it is a mess for me on my 8.1 pc, but on my win 7 laptop and newest chrome, there is no issue.
Also, it seems there is a trailing line of flat candles to the far right of the graph