Hello sure ,I want to inform about something

Good morning sir, I am new player of pro.

In the ss aane quest as you know we have to defeat Jackson and then talk to Jenson and take secret potion from blissey to give it to captain, I have already did whatever we have to done but still there is not blissey. As you can see I have defeated Jackson and talked to doctor Neumann and Jenson but still there is no blissey to give that secret potion. I have contacted player who have already did this , they told me that it's a glitch . please help sir i can't do anything after that in the game before completing this...