
How does stuff like this happen? Vanguard's own portfolio analysis tool is saying that Vanguard's own "total market" international fund has a regional composition that has 9% too little allocated to Europe and 8% too much allocated to the Pacific.
The main take-home here is not to get too obsessed with percentages of anything, because Vanguard's own data sources obviously do not know how much of the world's developed-stock-market holdings are in different regions of the world to an accuracy of better than give-or-take 8-9%.
Sure, I get it--their portfolio analysis tool is using a different index than their own fund is using. Very likely MSCI and FTSE's umpires made different calls about which countries are "developed," and some of the countries only FTSE thinks are "developed" must be in whatever region MSCI thinks is "the Pacific"--hence MSCI thinks I have too much in the Pacific.
In a way it's probably better to show how imprecise this stuff is, than to use the same index and get a false indication of "perfect" alignment.
Another detail. Again, this is for an artificial "account group" containing VTIAX only. This is pretty sucky:

Vanguard's portfolio analysis tool apparently has no idea whatsoever about sector or cap-weight breakdown in VTIAX. I assume that means that the the sector breakdown they show for my whole portfolio is silently omitting VTIAX without warning me about it. Since one of the explanations of differences in US/"International" stock behavior is that industry sector breakdowns are actually meaningfully different between the U.S. and the rest of the world, if VTIAX were included, it would change the whole-portfolio sector allocations. In short, the numbers it is showing me for my whole-portfolio sector allocation numbers it shows me must be inaccurate.
Here's another take, then: what this shows is that regardless of the widespread impression that nowadays international stock is basically up to all the same standards as U.S. stock, obviously it is not easy or cheap for Vanguard to get the same level of information we routinely expect for U.S. stock. The G in GICS stands for "global," so the GICS classification system is supposed to work worldwide. Certainly, the sector composition of international stock is not any deep dark secret, it can't be that hard--but Vanguard doesn't have it. It probably costs extra money or something.