Ah. That's what was causing my confusion. I was expecting only the character's proficiency bonus to apply, but I can see how both are perfectly valid interpretations of that verbiage.
Have you checked out the UA Ranger? It seems to solve this issue, as well as fix the overall balance of the...
Attempting to add a new Wolf companion to a 3rd level Wood Elf Ranger using the UA Ranger Revised. Part of that involves setting the companion as proficient in all saving throws. For some reason, this appears to be doubling the added amount. I.e. Str is 12, so +1, and adding Str saving throw...