Can you help remove bugs from this working image search tool with filters.

You can see what I’m trying to do here: https://a4jp.com/shashin-kensaku-image-search

I have an image search working but I need help with the PHP. The code works perfectly sometimes, but not all the time. I kind of know what the problem is but I can’t follow the code properly so any help would be greatly appreciated. I have just included the main file but not the language file or settings file yet as they are still being worked on.

I would also like the id of images to be searchable in the keyword area later on, or maybe I’ll just add another field to do this though.