Having done the timing belt change myself, I think you have started off in the wrong position.
If the #1 cylinder was at TDC as supposed, when you removed the old belt the camshafts would of moved because the valve springs push the cams over. It has to happen.
You then clamp the new belt onto the cams with the marks lined up, and when you release the new tensioner, it all pulls back into line.
There used to be a full procedure on here that talked through how to re-establish timing after the timing had been lost. Now that Deermagnet has gone, I am not sure if it is still here.

I hope I am wrong, but I think you have some work ahead of you.

PK