Daily Compare with Time Offset Issue

For the past several weeks, when I try to compare two days, the time offset setting isn’t working properly. I can set the time offset to any value other than 0 and it works. When I set it to 0, it just keeps the same previous setting. I cannot get it to set to 0 (no time offset). I’ve tried in Safari on Mac, Chrome on Mac, and Safari on iPhone, all the same.