Trimming ad code in YAN and AdSense

Please advise if anyone has encountered this problem: when inserting ad code from YAN or AdSense into the source, if the blocks are adaptive, the code gets truncated upon reopening the node. For example, I insert the code (see was.jpg). After reopening the node for editing, the code becomes (see became.jpg), after which the ad block stops working. The format in CKEditor is Full HTML.