Dynamic Link field - extra characters created

I created a custom concatate formula field to add a name to a dynamic hyperlink as follows:

Custom Field:  Customer PS Name Change
Custom Field ID: custentitycustomerpsnamechange
Custom Field Formula:  CONCAT(REPLACE({companyname},' ','%20'),'%20Price%20Summary%20History.xls')
Customer:  Allegheny College
Customer Field Result in NS:  Allegheny%20College%20Price%20Summary%20History.xls

No problem at this point


I then created the hyperlink custom field as follows:
Custom Field:  Price Summary History Lookup
Custom Field Hyperlink:  http://campus.net/Shared%20Documents/Price%20Summaries%20-%20BEST%20FINAL/{custentitycustomerpsnamechange}
Custom Field Result in NS:  http://campus.net/Shared%20Documents/Price%20Summaries%20-%20BEST%20FINAL/Allegheny