Changes not being reflected on page

I do not know if its the plugin or WordPress issue but I am using this plugin to insert a couple of iframes such as the following:

<iframe src=”http://www.casioca.com/products/Projectors/&#8221; name=frame1
scrolling=”auto” width = “1000” align=”center” frameborder=”no”
height=”720″></iframe>

The problem is that if the width changes in the snippet it is not being reflected on the page on which the snippet had been already inserted in. The block on the page representing the area covered by the snippet has to be manually resized by clicking inside the square and then dragging anchor points.

Also if the src url is changed in the snippet that change is not being reflected in the page(s) on which the snippet already has been inserted.

Do not know if that is normal behavoir or not.

https://ww.wp.xz.cn/plugins/post-snippets/