百度快照只抓取标题不抓取描述怎么回事

如题,最近我发现做的一些新的企业网站百度快照只抓取标题,却不抓取关键词和描述,也没有图片,这是怎么回事
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<a href="http://ask.seowhy.com/uploads/questions/20161017/8304448d2be1c391c71f509cdbed1421.png" target="_blank" data-fancybox-group="thumb" rel="lightbox"><img src="http://ask.seowhy.com/uploads/questions/20161017/8304448d2be1c391c71f509cdbed1421.png" class="img-polaroid" title="" alt="" /></a>
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<a href="http://ask.seowhy.com/uploads/questions/20161017/993cf2354187693cee2ca1c97bb69142.png" target="_blank" data-fancybox-group="thumb" rel="lightbox"><img src="http://ask.seowhy.com/uploads/questions/20161017/993cf2354187693cee2ca1c97bb69142.png" class="img-polaroid" title="" alt="" /></a>
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没设置好