Blank frame at the end of the input animation

Hello my brother, I hope you are well. I wanted to comment on a problem I have. It turns out that I have a decklink duo 2 for 2 video outputs in hd. In one of the outputs when I release the signs everything works fine, but in the other exit that carries the key, for the insertion I always release a target at the end. I have verified that it can be when inserting text in adobe animation templates. Do you have any idea how I can solve that problem? Thank you How do I have to solve this problem?