Facebook can add characters to string queries on posts. We have a workaround available to help get your redirects working properly.
There are two properties that help work around this issue:
Retain Query String: Controls whether query string parameters will be carried over to the From URL
Match Query String: Controls whether the redirect will require the query string to match
Important Notes:
If the Link To has a URL with a Query String, do not enable Retain Query String.
If a URL Does Not Have a Query String, enable Retain Query String.
Regardless of whether or not your URL has a Query String, always disable Match Query String.
The Query String is the ?Command=Something; for example, .aspx?AMID=112
Who can use this feature?
System Administrator | Owner
Instructions
Navigate to Modules and on the Site Tools tab, select Redirects:

Select the Category/Domain your redirect is in:

Locate your redirect and click Actions:

Select Modify:

Under Additional Details, disable Retain Query String and Match Query String:

Note: If the Link To has a URL with a Query String, do not enable Retain Query String.
Select Save Changes at the top of the page:

Add to Facebook as normal