Android 9 (Moto) and Android 10 (Pixel4a) cannot display Basic or Multimodel

[kmci]

I can no longer change the initial display by swiping up: the app opens to the wind map but whereas before I could see a bar at the bottom for Basic, and could then swipe up to select Compare/multimodel, swipe up does nothing.
It happened suddenly, and on both Android versions (9 & 10) and on 2 different phone models, Moto & Pixel. On my laptop it is fine, and if I send the laptop's URL to the phone I can get to it.
Any idea what's going on? Thanks for a GREAT app (I paid for it, I love it!)