Email is triggering multiple times

Summary

Email is triggering multiple times on Service request object

Content

Hi Team,

We have two email templates and which will trigger through object workflow based on the SR type(category) and SR status. Below is my scenario

1. If the SR status is resolved and the category value is 1, then I need to send the first email and this is working fine.

2. If the SR status is resolved and the category value is other than 1, then I need to send the other template. Here when I mention the category value as not equals to category 1. But the application is not accepting not equals(!=) operator. So the mail is not getting triggered