Is the last post your email subscribers received also the latest post available
Although you reduced the Original Feed of your Feedburner feed to only 3 posts,
, you didn't fix the underlying cause - the many base64 embedded images in your posts, instead of properly uploaded ones;
10 such images in your 25 latest posts. Many services, not just Feedburner and Bloglovin
ignore or just can't handle indivual posts that are more than 100 KiB in size.
The post 2016/08/the-most-effective-ways-to-stay-warm.html alone has 3 base64 embedded images,
for nearly 300 KiB increased size. Normally uploaded, the post would be only 9 KiB.
The small amount of junk Word fomatting in your posts is almost inconsequential after that.