Always worth to try reinstalling USA Updates but not sure it will help since 4CA1 Helipad was part of Sim Update 11: Release Notes for 40th Anniversary Edition/Sim Update 11 (1.29.28.0) Now Available
Not sure either if it is part of the 40th Anniversary POI package, you can always try to delete and reinstall it:
Have you checked that nothing is pending to be updated in your content manager ?