Franks patching board

[Frank Savage]

We had weather change from dry and sunny to moist several hours ago. I came to folow on the boards and found three of them torn beyond any repair because of this. The rest is nicely sound.
I think I have the reason sorted out, because it seems that it breaks where the slitting machine was stopped in the middle of the slit for some reason and when this is sanded down and placed in such a manner that former edge of the slit is close to the glued and screwed fence. Also I know now how to avoid such unpleasant surprise in the future-both in wood selection and sawing patterns.
But no way I will try to hide the fact I´m pretty new to working with quite higly figured wood. The picture below is not good at all, but I hope it gives some idea about what gives me a bit more hell than I expected. Even the plainest pieces have such waves and curl, but some of them are cut in more favourable way than the other pieces. BTW, the surface is just as I dropped it from the plane-no sanding or fine scraping at all.