email filters not firing properly

[moby999]

I made a basic filter to move emails where the body contains the word "unsubscribe" into a specific imap folder. However it seems like the filter is missing over half the emails from newsletter which do contain the word "unsubscribe".

What's going on?

The "unsubscribe" text isn't an image and it doesn't appear to be some weird unicode that looks the same but is actually different characters.

[JohnDoh]

what filtering plugin are you using and what is the exact rule you have created?