@costmuffled
There's nothing grammatically wrong with it either way. However, “however” should go between two things that are different. One clause should seem to disprove the other. “He's a great guy, however, he's killed a lot of innocent schoolchildren.”
Regardless of the punctuation, that “however” is in the middle of what is functionally a list of very similar consequences that do nothing to negate each other. It doesn't belong there.
You can skip this, but what you've been experiencing is the natural effect of focus. At first, there was an error that caught your attention, so you weren't paying attention to the error that followed. Then, by playing with the sentence you made it novel, which to almost every brain is a good thing and makes you think you've made it better.