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.
Toggle on "Retweets"
To enable "Retweets" 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. Toggle that setting on, and you should see all retweets appear in your Feed.