It looks like iOS app just out of sync. Try relaunching Blynk on your iPhone.
Remember to not do editing your project simultaneously on different phones.
When you touch the button application sends data over BLE channel, which is a bug, since your connection type is WiFi. Looks like if you have a project successfully running with BLE connection it won’t actually release BLE after you just change connection type. We’ll fix that.
As a temporary workaround you can add a BLE widget back, establish a BLE connection and explicitly hit the “Disconnect” button in BLE widget settings. Or just make an failure attempt to establish a connection from BLE widget settings.