What do you have under settings->reading?
I’ve got “For each article in a feed, show” set to Summary
Change that to show the full text.
The only time I set my RSS feeds to full text is when I’m feeding another site via RSS and need the full text to transfer. Those sites are intentionally left out of the public view.
There are two problems with full text…
One is where anyone reading the feed with a RSS reader has no incentive to return to your site to read more. You want people using the RSS feed to view the first part and title and then have that draw them to your website.
The second is any site pulling a feed gets your full content with no real incentive for their readers to visit your website. I like the syndication aspect of RSS feeds but they need to entice the recipient site’s visitors to visit the originating site.
There are some email subscription programs that work very well with truncated feeds… again the full text removes any incentive for your reader to return to your website to read the balance of the post. And in this case, results in huge emails that often get passed over and seen as annoying.
In my case, as a content aggregator, I have to run extra software to truncate the full-text feeds and create the ‘read more’ and attribution links. Often that’s the deciding factor when selecting a feed for inclusion or to be skipped.
You seldom see full text feeds from the better run, commercially viable websites but a hobby site might choose to run the full feeds. This is all worth considering.