Maybe a syncing error? or just displaying the app syncing/loading default value? As there is a random or default number/value declared (by the developer) in every data but mostly it declared as zero or blank, it shows before showing the exact data from it's sources.
Anyway, I have a trust wallet app with balance on it but didn't encountered such thing while opening the app.
I presume the same thing which is on syncing error or simply some visual bug? I havent able to use trust wallet but i did make some experience on Binance which my balance is showing off some higher amount in terms of fiat but when the time you do make out some hard refresh then it do shows off the correct one.So far that issue didnt happen again.
There were actually same scenarios with this.
https://www.reddit.com/r/Zerion/comments/lebuix/incorrect_funds_showing_in_trust_wallet/https://www.reddit.com/r/trustapp/comments/mzw2hf/trust_wallet_displaying_too_high_of_a_balance/