It probably is, I don't know. There's too few of those planks to tell for sure - out of 3 around the Frontier area (I forget those route names), the one on the sandstorm route has the bending at its top; the two by Mt Stark, neither has that slight pixel mis-alignment, but the left one does seem to increase in elevation. Some weird hidden things get revealed in the environment with this camera change code, like funky 1/2 elevation hills along Cycling Road, so it might be something like that.
There's a lot of small deformations that are rampant throughout these maps due to being constrained to the elevation of the game, so for these maps it's next to impossible to get them to appear pixel-perfect as intended. Where I can blend two edges together to make them seem conformed, I will. It will likely be fixed, if it will be fixed, when it comes time to clean up route 215 and remove the trainers/put all trainers in/mark the items and hidden items.
BTW, I found that weather modifier code I wanted, so here're some more maps. I think I'm done for the day now, however...