Your bottle is a screw top. Air could very easily be escaping through the threads of the jar top.
Don't rely on visible action to prove fermentation is happening. You need take SG readings to see if there is any sugar, and you need to take a second one a few days later to see if the SG is still going down. If it's still going down, then you are fermenting. If it's not then your fermentation may be stuck.
By the look of what's inside your jar, you either have a lot of floating solids or you have a healthy Krausen on top which to some degree probably means you are still fermenting.
Also the moisture at the shoulders of that jar look pretty wet to me, which generally also means you are still offgassing CO2, which doesn't always mean you are still fermenting, but is another indicator that you may be.
Finally, I have seen ferments complete so fast I thought the yeast never activated. Only after checking the SG did I realize oh, it's already finished. I had one do that quite literally overnight. Poof, done.