Maybe this is leftover money from your latest purchases / sales?
I hold VHVG too - it is defo not paying anything out, no dividends nor anything else.
When I look into the transactions for this ETF - all I can see is a list of purchases and sale transactions, nothing else.
How about this:
You know the dates when this cash “appeared” in your account, right?
Go into transactions, choose the particular portfolio you’re holding these 2 ETF’s in, look at each transaction type separately and look for these dates.
If you still can’t see it / work out - please contact IE CS directly.