Accounts-ui loginButton not showing on iOS (iPad, iPhone)

Got all the setup working, meteor add accounts-ui accounts-google

{{>loginButtons}} in template. show fine on safari, chrome. also show fine in ipad mode in both safari and chrome.

running on an actual device, no buttons show up. seems recent as I swear this was all working with previous versions of meteor.

any ideas or style override hacks to try to force the login to show. not sure how to debug, given it works everywhere but on a device.