Subject: Vanguard ETF stats
Vanguard ETF webpages have a "portfolio" section that lists their P/E, P/B and RoE.
Sadly, the P/E doesn't match P/B : RoE ratio.
eg
for VOO (S&P 500 ETF)
PE is listed as 24.7, but PB 4.3 / RoE 24.61% comes to 15.

for VXF, PE is 18 but PB/RoE is 25.

Am I making some elementary calculation mistake here?
Even if taken on different dates in the quarter, that is a pretty significant discrepancy.