There are two types of filters in UBB.threads; the censor is a filter that affects post content being inserted into the database and is a simple tool which does a simple find/replace, whereas the Active Text is a powerful tool which preforms a regex match based on the keywords in your active text settings when the content is being read from the database to the user requesting the post content. With both of these tools we're instructing PHP to replace all matches within the post body.
The recommendation for you is to use a more broad set of keywords for your active text entries; instead of "triumph" which is a fairly common english word (meaning victory), try matching "triumph bikes" to get around the regex matching the keywords within URL or Image entries. Examples would be instead of "oil"/"oil filter" or "air"/"air filter".
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