Had same trouble, here's the solution: In 4 line of script change *50 to some lower number, for example i set it to *25.
Before:
Imagesearch,,, 600, 0, 800, 200, *50 *transwhite sarnencampment.pngAfter:
Imagesearch,,, 600, 0, 800, 200, *25 *transwhite sarnencampment.png