Adjusting the start of a region shifts the timing of the waveform inside the region

As the title states, I recorded something and now, when I go to trim the start of the region, I can see the waveform inside the region shift to the right as I do it. This happens whether I drag the start of the region to the right or I split the start from the rest of the region and delete it. I’m assuming this is some edit setting that I accidentally triggered with a key press but I don’t know what it would be called, so any info would be appreciated. This is on a Mac, btw.