Me bad (and a bit thick), I'm going to hold up my hand here and apologies
After a conversation with VS over this yesterday and now that (I think) I now have better understanding of VS tier points (lol.....only taken me 17 years being a FC member), it turns out the tier points you now see online are your rolling 12-13 months TP's so the 625 I see is indeed correct baring 1 missing DL flight, which VS have said they will get added.
I've have indeed earned 225 tier points so far in my current fixed membership year (should be 300 once the missing DL TP's get added).
Apparently, this same issue is confusing a lot of people and VS are going to implement a change at some point so you will also be able to see your fixed membership year tier points as well and your rolling ones i.e. to check you have earned enough TP's in your fixed membership year to maintain your status.
Also regarding the viewing transactions. You can get it to show older transactions using the 'custom' date range, though it is a bit fiddly. I've found my previous VS flights from August doing this as I wanted to see where my 625 TP's where all coming from. Only making the date range a maximum of 30 days seems to work and lets me go back as far as March 2014 doing it that way.
400 TP's (16 TP's in old money) from a return discounted Z fare to BOS with the bonus TP promo that was running at the time which was the extra 3 TP's each way in August:
225 TP's from 3 x DL First flights taken in Dec, though that should be 4 with 300 TP's: