Incorrect data
Historic data for IWVL.L and VWRD.L are wrong. For instance IWVL is correct today, at about 34.02 - but look back to 19 Feb and before and it's quoted around 24 or below. It was never at that level on those dates.
Likewise with VWRD - it's correct today at about 108 but go back to 19 Feb and before and it's quoted at around 80 or below. These are both broad market ETFs - they don't ever show these kinds of huge moves and the historic data is certainly wrong.
It's the same with many other Vanguard and Blackrock tracker ETFs. For example IJPN is quoted at 1233 today but at just 12.75 on 18 Feb. IFFF data disappears altogether if you choose a 1 year chart.
There are other odd pricing anomalies too. Unilever (ULVR.L) suddenly shows a drop from about 4000 to about 40 in April 20. Obviously that never happened.
So - lots of your historic stock price data is wrong. Can you remedy this?