^ A small factor amongst many other small factors I assume.
Humans are always going to bring with them a certain level of varience in the implimentation of any standards. Then, as has been said many times on this forum, Ofcom's rules are nothing if not open to some interpretation. What is overtly sexual to Ofcom is likely quite different to what is considered overtly sexual by the average guy on here. (Ofcom's rules can only ever hope to pander to social norms in any case of course. A foot fetish fan is always likely to get way more out of the day shows than Ofcom might like as a result!

)
Anyway I can see there being several other things that might cause the kind of content 'inconsistencies' we see. (I take it you were being strictly accurate when you wrote "at the same time" above nottooold... Nevertheless this list includes the broader view of possible inconsistencies in approach across a given shift):
Who the producer thinks he (or she of course) should be paying attention to that day based on what experience they have had with the particular babe's compliance in the past.
Which outfit has caught their attention as possibly problematic at the beginning of a given session and in what way.
A personal fixation with one type of compliance as more problematic than another.
Whether the producer is on set at the time or watching from his screens in some kind of gallery (a simple geography might well mean one babe's attics are missed while another is restricted).
A producer's personal preference for one babe over another on a social level.
A favouritism for one babe's way of working over anothers.
What body part the memo on compliance has picked out for a paticular focus that week!
One babe being savvy and bothered enough to take advantage when she knows the producer is away from his/her duties while the other babe is not.
A change in back office shifts and personnel during a session that we the viewer are unaware of.
A difference in who is actually watching for what and from whom. (We have been told for instance, IIRC, that 'logo man' is not, not usually at least, the producer. The implication being that it's a more junior role I believe. Likely therefore that he/she is told to focus on certain things - perhaps to the detriment of other aspects. In other words this adds another level to it - one of the
communication of ideas and consistency.)
I doubt I've been comprehensive with the above. There are most probably other reasons that I've missed.