I think I'm seeing the same problem and I've found a temporary workaround. When I tap the 4-day forecast the map jumps from my home location to one much farther south. (I think it zooms to whatever location is at the lower center of the screen.) I've found that switching the button for "Move the map to change the forecast location" under "More" at the bottom of the forecast keeps the map centered on my home location when it loads the forecast. I don't really want to have this option on, so I'm looking forward to the fix.