What causes the first kick after unmuting to sound muffled?

I’m having a strange phenomenom with my A4. I’m sure there’s a logical explanation to it, I just don’t know what could cause this behaviour.

The problem is this. When you unmute the kick track, the first kick of the pattern sounds muffled somehow. It does this repeatedly, and it’s not caused by me unmuting the kick track too late or anything like that.

As an example, here’s a track I made today. You can hear it at 1:00 and again at 4:48

https://soundcloud.com/user4904810/noises-and-artifacts-pt-2

It didn’t do this before, but when I changed some kick settings it started to do it.

I can easily go back to the previous kick, but I like this one and I just want it to behave itself!

Any idea what could cause it?