Weight tracker

My pre-pregnancy weight is in my log at 132 and 130 at 2 weeks pregnant. but my pounds gained/lost is basing data off my weight in a later log when I was at 127. I'm now at 128 and it's saying +1 lbs this pregnancy. Shouldn't it be reading -4 lbs? Or even -2 if it won't calculate anything earlier than dates during pregnancy?