It looks like there is a vent issue with that mold. I won't mention the name of the company but I have 5 molds of a particular bait from that company and 3 of them do the same thing as your picture shows. In my case I have tried every trick I know including contacting the company 2 or 3 times about the issue. To their credit, they sent me 2 replacement molds. One of those shoots good but the other one still has the same issue. Go figure. LOL

I have 50+ different bait molds from several different mold makers and I only have problems like you are having with 2 different style bait molds from that same company. I would contact whoever made the mold and tell them about the problem you are having. It could be that you just got a dud mold or maybe it's a design flaw that happens with all of those same molds. Anyhow, I finally gave up finding a solution to my mold issues and just accept that those baits will have bubbles in them. They still catch fish but it's still frustrates me that the molds don't shoot like they should. I hope you have better luck then I did finding a solution to your problem.