This is because you activated the subscription to Filmora Creative Assets 7-day free trial when you purchased the perpetual plan. 
The Filmora Creative Assets plan is designed to provide users with access to all additional resources for their video editing projects. By subscribing to the Filmora Creative Assets plan, users can unlock a wide range of video effects, transitions, titles, and audio files that can be used to enhance their videos and make them more engaging and professional-looking. Believe you've seen the icons adorned with pink diamonds. The utilization of a resource with a pink diamond necessitates possession of Filmora Creative Assets.
If you don’t want it, follow the below steps to stop the subscription.
- Login Wondershare Account Center
- Click Plan & Products
- Go to My Subscription > Manage Plan > Cancel Subscription to stop the auto-renew.
- Choose the reason for cancellation, and then select Continue.
- Follow the instructions to complete your cancellation.