Images for latest post not showing

Hi, great plugin!

But latest post images are not showint – when I inspect the html I always get this:

<img src=”image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==” alt=”” width=”” height=”” style=”width: 40px; height: 40px;”>

Why is that?

https://wordpress.org/plugins/popular-posts-tab-widget-for-jetpack/