Duplicate attribute class

Good day!
Please forgive me for my bad English.

There is a problem in the duplication of the Views module classes in HTML.

For example:

Line 143, Column 47: Duplicate attribute class.

<table class="views-table cols-2" class="views-table cols-2">

OR

http://validator.w3.org/check?uri=http%3A%2F%2Fwww.acquia.com%2F&charset...

Line 624, Column 122: Duplicate attribute class.
…nt-page---we-are-hiring" typeof="" class="entity entity-bean bean-basic-block">

<div class="entity entity-bean bean-basic-block clearfix" about="/block/front-page---we-are-hiring" typeof="" class="entity entity-bean bean-basic-block">