Adobe Bridge Workflow always resizes images when converting to JPEG

We're using a custom workflow in Adobe Bridge Workflow to generate JPEGs from TIFFs, and we'd like to retain the same resolution and pixel dimensions of the original files. We used to be able to select "Scale image: 100%" for this. Now, however, it always will change the resolution to 300ppi unless we select a resolution and dimension to resize to. This doesn't work great for us since we generate JPEGs from files with varying dimensions and resolutions. Why does Bridge always change the resolution to 300ppi and is there a way to fix this? We're using version 14.0.1.137.