No problems don,
Depending on what the over all drop in traffic is, that may well relate back to slower sales. That won't be a template issue, however i must admit that I did find the layout a little busy and over bearing myself.
Hard to pin point anything specific with slow sales over that sized period, maybe after two weeks or so, some more accurate deductions may be possible.
I tend to think if things have been travelling ok, and have slowed for now with you changing nothing, then it's just a general blip. Keep your eyes on the traffic, see if that keeps dropping or starts to pick up again and then measure sales via those numbers.