Streaming 1 hour behind

Using Safari 16.5 on Mac 13.4, streaming from AT&T Direct Stream. When selecting what to watch using the guide, it shows the correct program on air, but airs the previous program. I have to reload the page numerous times (sometimes up to 10) before correct show streams. But if I set it to record the show, the correct one records. Only does this with Safari; other browsers work fine. I also have an iPad, which also works fine when streaming. Only occurs with the iMac.