Tank bubbling

So I took my Zeus sub ohm tank apart for the first time to clean it yesterday as I am switched to a new flavor. And now I am getting a bubble in the juice everytime I take a hit from it. I didn’t notice this happening before. So I am worried I did something wrong. There is no sign of leaking as the top of my mod has been bone dry. And it appears to me vaping just fine. Am I just over thinking it.