@seanj67 - my cholesterol numbers always have an inconveniently high total, although my breakdowns are excellent, with Trigs at 0.75 at last count. However, to get to the chase, my GP (who has just moved from the area - boo his) was always willing to discuss and share ideas. We shared a few academic papers etc.
Anyway, when my total breached 8, at one time, she suggested a referral to a specialist Lipids clinic for a consultant viewpoint. I deferred, due to nan imminent prolonged trip, and next time tested, pre-referral, the total had reduced, so no need to go.
I think, in your shoes, I would be asking for a referral as those Trigs look pretty unusual to me, in my lay state.
I am absolutely not suggesting anything in my message, but I'd want them to be looking at familial hyperlipidaemia, which can throw out very odd readings, and for anything else potentially causing this.
If I am interpreting correctly and you've already had a second test, in rapid succession, then maybe just wait for the referral (if your Doc agrees), but if that read out is from the first and only test in recent times, I'd ask for a retest, and have it as early as possible, say eight in the morning, and have it on only water, if anything in the morning.
Just a final thought. If you take any other meds, could be worthwhile checking if any of them have the potential to impact lipids? Maybe also ask Dr Google if he/he knows of any factors impacting cholesterol testing?
Where are you in the U.K.?
Time for a deep dive on those numbers methinks.
As I say, I am a layperson, not giving you advice, more emptying my brain, thinking how I'd tackle this challenge. Good luck with it all.