Bank transfer verification

When I try to make a transfer from my HSBC account into my Revolut account using my LG Android smartphone the “worry circle” just goes round and round and the expected HSBC verification window never appears. Yet if I re-boot the phone I find the transfer has been made, even though I have not entered my HSBC verification code. Using my iPad mini everything works as expected, i.e. the HSBC verification window appears, I enter my code and the transfer goes ahead. This is all using the same internet connection at the same time. Could there be a glitch in the Android operating system?