Stock chart paints and then goes away in Safari Version 11.1 (13605.1.33.1.2)

When I choose to display a stock chart, the websites acts as it always has provision the stock particulars and the chart except the cart graph information paints and then goes away.  If I reload the web page it paints again and then goes away.  What software (flash, java, other) is being use to produce the chart info?  I'll reload to see if the problem goes away.