How old is the tweet that you can see on Twitter? Unfortunately, Twitter’s API only returns results that have been sent within the last 7 days. If the results that you can see in Twitter were sent more than 7 days ago, these will not show up in the Twilert, however Twilert will capture any new tweets going forward.
If the results are less 7 days old, the likelihood is that there is a slight error in the way your Twilert is written. If this is the case, please send us a message containing your account details and the specific twilert and we will be able to look into it for you.