If you have recent tweets that are not showing up in your POWr Twitter Feed, this may be due to those being retweets. Whenever you use Twitter's "Retweet" option, even if you do add your own content to it, Twitter's API treats that tweet as a retweet.
Ensure "Show Retweets" is Toggled On
"Retweets" are toggled on by default, but you may have toggled them off when editing. In your Twitter Feed, open the Twitter Feed Editor (or App Settings, if you are using Wix) and go to Content > Twitter Feeds > Show Retweets. Check that toggle is set to On, and you should see all retweets appear in your Feed.
When a tweet starts with an "@", it's treated as an @ mention at someone. We don't show @ mentions, only general tweets, and retweets (please feel free to read here for an overview: https://help.twitter.com/en/using-twitter/types-of-tweets). Therefore, whenever you post and start with an @, you're actually preventing it from showing up in people's feeds on Twitter as well as it also not showing up in your POWr plugin.