It will be difficult to debug as this is not the same behavior.
are you able to see this issue yourself ?
for now what we can try is to clear some bad settings :
1 - Set in the backend "HTTP and HLS Parameters"
"HTTP : Start parameters" to "none"
2 - it seems there is http tag not opened properly, only the end of http tag is present
please edit your article in raw html view and clean the html code, remove the p tag around the jwplayer shortcode