Can you not check out from your side without the screenshots?
I have been tracking south african south coast between Port Elizabeth & cape Town.
The cell phone app matches "windguru", but there is still discrepancy with the laptop app.
In embed, Windytv displays ECMWF model which has 3h step. 1h step, to which you are referring, is only available for the GFS model at Windytv regular webpage.
Yr.no has its own model for northern countries, which has step 1h. But, for the rest of the world, they have 3h step - they are using ECMWF model as Windytv.