Can you give the steps how to reproduce this? I found one rotation bug (when usb port was pointing to right) in which the image was rotated too much but this is not the same one.

I tried to reproduce that mirroring issue by uploading some images taken in Textractor/selected via Textractor to Twitter and everything worked correctly. Did you scale the image before upload in the gallery app and did you take the image in Textractor or did you select the image?