Hi Skandha
Yes, I desactivated all plugins and when I desactivated Jetpack particulary, the problem did not existe.
I submitted the problem to Jetpack and He said :
“We primarily provide support in English. I can use Google Translate to understand you, and will reply in English.
I understand the 48.68405471.9358039 text is appearing on your homepage when Jetpack is active. Is that correct?
If a theme supports it, Jetpack allows posts to be tagged with a geo location. It looks like your theme may be showing the geolocation from your latest posts, which are those numbers.
The quickest way to check that is to test for a theme conflict.
Temporarily switch your theme to a WordPress default theme like Twenty Nineteen. Then check for the geolocation numbers on the homepage again. If the geolocation numbers are gone, then you know it’s a problem with the theme, and you can reach out to the theme developer for a fix.”
I changed theme and the problem disappears.
Thanks very well for your help