This decision is taken after discussion in TLM forum. In Ballari Junction there is a bay platform (PF#1A), a through platform (PF#1), an island platform (PF#2&3). You can see pictures of platform number boards captured by me in this blog /blog/post/3224375
I don't have idea regarding Yelahanka platform numbers. "Platform no.3" which is written on notice board, might be a temporary number. PF#1 & PF#2 of Ginigera together is a double discharge platform and there are other stations in IRI like Kanchrapara (KPA) where double discharge platform is counted as one platform only. So at Ginigera whether double discharge platform is counted as one platform or two platforms will be clear after platform number boards are fixed.