as described in the discussion title, I see that string under the bank account entity type. I'm using the last beta published on TestFlight (7.3.7.BETA-4), the one listed here: https://app-updates.agilebits.com/product_history/OPI4#v70307004.
For same entity of my vault, on other (macOS/Android/Windows) app, all is ok.
1Password Version: 7.3.7 (70307004)
Extension Version: Not Provided
OS Version: iOS 12.4.1 (16G102) - no jailbreak
Sync Type: Not Provided