Using paid version of Post Grid. Title and Excerpt overlapped by images on mobile version. I viewed on multiple mobile browsers. Grid looks fine on PC. Post grid didn't look like this before. Maybe since July update? Using "Porfolio" as posts in grid and modality wordpress theme if that helps. Screenshot of mobile display: https://www.dropbox.com/s/nzvxyjmxp67vato/IMG_6831.JPG?dl=0
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Do you used fixed height for grid item width? please use auto height on mobile device.
Please see the screenshot