Hi Tink. I do love your siggy pic. . .
There's nothing wrong. This board has a code built in that keeps people from adding signatures or photos that are too long/wide/big, etc.
I prefer smaller signatures (
150px tall x 300px wide), because they don't take as much time to load on the page, and they don't clutter the board as much. So the code will reduce any siggy photo that will be too wide for the board.