XF 1.5 slight style issue for users in Windows7, I'm seeking where to fix it

sross

Active member
Hi, this only seems to be with win7 users, they are seeing a black line on part of my pages, I have attached a screenshot. The line appears under the date and under quote boxes. It does not show anywhere else or on other systems. I figure it is an easy fix but not sure where to correct it. Thanks!

Lines.jpg
 
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