This is a Facebook setting, but there are a few things we can do to prevent this from happening.
In order for the logo to display in full, Facebook requires the logo to be at least 600 x 315 pixels in size.
If you are able to adjust the dimensions of your logo, please do so.
In the meantime, our Tech Hero is working on a script that will take your logo, make a new version of it, and adjust it to FB's specifications so that it does not get cropped. We can't assume that everyone will know how to do this themselves, so we are going to try to solve this issue...please bear with us..