How can I fix this. When I add topaz it's showing the layer underneath

Hi b1xhsh, thanks for writing in.

1. Does it happen only when you apply Twixtor?

2. Could you share a short screen recording showing the issue, plus a screenshot of your Timeline panel with the affected layer's properties expanded?

Also: Twixtor is a third-party plugin from RE:Vision Effects, so depending on what we find, the issue might need to be raised with their support too. Looking forward to your reply!

Thanks,
Nishu