I installed a Britax Boulevard rear facing using the LATCH system. I got the LATCH harnesses good and tight. The seat seems to be able to be moved sideways a ittle bit and if I lift from the seat at the top, where my babies head would be in a rear facing seat, the whole assembly will lift up. Given the design it looks like this is normal but I just want to be sure. We bring the little one home on Monday so any input would be appreciated. Thanks.