Not all files are uploaded :(

I have a rule setup to optimise images, then move them to another folder, then upload them via ftp, then visit a web url that clears the cache for that image (for a website). Usually I'm exporting a handful of images via Lightroom into the watched folder. The problem is that not all images are fully processed. If I export 10 images, 7 might work and 3 don't get to the upload and script stage, they are just optimised and moved.

Is there another way of achieving this that's reliable?

I suggest checking the log to see what's going on. Chances are there's an error.