Omigosh what have I done?

It seems that hours after using amonia to bend some 3/32 balsa sheet around the wingtips of my Sig Astro Hog that a strange phenomenon has occurred. The wood is bulged out above the surface. This didn't happen to the other wing so naturally I'm cornfused.

I sure hope there is some way to fix this ...

Can anyone offer any suggestions and perhaps an explanation?

Baffled in Fresno.