Well, im not sure if its a mistake but it does not look right. When i was putting the Hardiebacker down on the thinset I started from the left to the right which seamed fine at the time, the problem i came across is when I layed the second sheet down there is about a 1" space between the hardiebacker and the tub.
I pre-cut and layed the board first and made sure it fit, but then during the install i guessed it would be right and didnt check it until it was too late.
What should I do to secure the space from water, can I fill it with silicone? should I leave it alone? Thanks