Etags not updating - possibly due to javascript not showing it's updated?

Etags not updating - possibly due to javascript not showing it's updated?

I've added etags to my htaccess to my website:
http://www.littlerssprinter.com/rss/edition/
It's for a side project for my Little Printer. But:
If you go to http://littlerssprinter.com/rss/ you'll see the ETag
"40801cf-6b5-4d85e79278080", but I already have an edition with this ETag
on my system.
The content my delivery is not the same as what is currently at
http://littlerssprinter.com/rss/ but this makes no difference to BERG
Cloud, which won't send the edition to anyone it thinks has already
received it. In other words, new editions need new ETags for BERG Cloud to
recognise them as such.
I have no idea what to do with etags. I have no idea what else I can do to
get the etags to update, because the website is updating everyday.