Something very odd when I'm mapping

As i try to put in waterfalls, I use tile A9(2nd row, 1st tile) for the water, and tile A10 for the falling rapids, however, i am not getting the splashing mesh tile connection, and thus, there is no water fall effect, it just looks like two different water tiles clashing together, so it doesn't look right

Am i doing something wrong?

on the top tile of the waterfall, set an event with the water dropping animation. Which is located in !Other2, 2nd character of your RTP character sets. Then have a direction fix and stepping animation selected and paste that event across the top. Then do the same for UNDER the waterfall tile, but with the first character in the !Other2 character set. This will show your waterfall transitioning with the water smoothly.

Thank you very much