It would appear that the new system has no limit to the number of characters between the letter f and ck so was indeed finding an f in your sentence and then finding an unrelated ck and assuming you are trying for hardcore porn posting. Such is the logic of the IT world!
I'm sorry about the false positive, but in setting up the new filtering system to prevent hardcore porn, drugs, sex, gambling, home loans/sharks, money pyramids, advertising and so on, I'd rather find the occasional false positive than find the forum full of any of the above. I have worked in a boarding school for teenage boys where every student had a school owned laptop. They exposed me to far more than I ever wished to find out about the internet (way worse than many of you can imagine) and as the sole IT engineer/technician for most of my time there, it was me that got to produce the evidence, printing it out to give to the relevant house/head master (and on one occasion house mistress), keep a log of it and then block it and all other sites that the culprit(s) had found and any they linked to. My time working in IT for the armed forces did not in any way prepare me for teenage boys (and occasional girl) and what they got up to.
Please just report any more issues using the report button. Often it will be a link that is the problem. Because of advertising (or the above), we restrict what new members can post initially. Links are by far the biggest culprit, even in quotes of a full member, simply because a quote can easily be edited by anyone even vaguely IT aware and 'you' could easily edit the quote to include a link that wasn't previously there. So everything in your reply box, quotes included, gets checked.
Once you have been a member for a little longer you'll find the system automatically relaxes and links just go from banned to needing approval to being allowed without question.
If you find any words replaced either with a different phrase or with *'s then that is a different matter altogether and it is censorship that is kicking in. The site is family orientated and words in that list (I can't give examples because even I get censored) are here to stay, but should be easily guessed! Just remember that shiitake has a double 'i' in it and you'll be fine! (This is a recent example of it kicking in and with a single i contains a censored word!)
SNSSO