My exported photos are all converting to color from black and white after exporting them. Why?

Lightroom cannot convert a B&W jpg to color. The only explanation I can think of is that you did not shoot in jpg, but in raw. You then imported these images with 'Embedded & sidecar' previews. That means that Lightroom is showing you the images using the camera-generated previews, and if your camera was set to B&W those previews will be B&W. When you export the images however, Lightroom will render a new jpg image from the raw data, and the default develop settings will be a color image.

Are the original photos in camera RAW or JPEG?

"My exported photos are all converting to color from black and white after exporting them. Why?"

• Are you saying that your exported JPG's display as colour or that the metadata shows they are colour images?
• Do you have any export plugins or presets that could be affecting the export?
• I assume that in LrC DEVELOP, the TREATMENT is showing as BLACK&WHITE or did you just desaturate the colour.

I just tried this on one of my B&W TREATMENTS and it exported B&W but with an sRGB colour space.

In your Export settings, what did you use for File Settings > Image Format?