What is causing "dbg: zoom: skipping rule"

I have a custom rule:

body WRITE_US                           /\b(?:or write us at|write us 
directly|physical opt.?out|write( to)? us at)/i

 From the spamassassin debug output, I see the line:

Jan  3 15:21:35.132 [3478024] dbg: zoom: skipping rule WRITE_US, code 
differs in compiled ruleset '(?i)\b(?:or write us at|write us 
directly|physical opt.?out)' '(?i)\b(?:or write us at|write us 
directly|physical opt.?out|write( to)? us
at)'

Can I ignore this error message?  Or is there something wrong with my 
rule (it does get triggered in spam messages).

As an aside, I also see this in the output:

Jan  3 15:21:35.132 [3478024] dbg: zoom: skipping rule __PDS_SEO2, code 
differs in compiled ruleset '(?i)losing your (?:[a-z]+ 
)?(?:rank(?:ing)?|results)|rank well on [a-z]+\b' '(?i)(?:losing 
your|your website) (?:[a-z]+ )?(?:rank(?:ing)?|results)|rank well on 
[a-z]+\b'

Thanks. - Mark