retovital You can see 2 intelligent shoes on my webpage: the first I changed only adding some eeeeee to the word shoe and you see the difference compared to the original (withouth changements) just below.
The apparent issue is probably due to HTML tags getting stripped as you must have edited the page named Intelligent Shoe with editor in visual
Although, Editors always can give you the power to create the kind of content you want, without limitations, and without needing to know or learn HTML however, there could be instances when HTML tags or other codes gets stripped for which you can try to apply the workaround shown here as this could be the reason due to which you might be facing such issue
Also, You may wish to refer to documentation for the specific theme