Variance is configured but EIGRP still uses only one path

Branch router R1 has two uplinks toward the data center LAN 10.50.0.0/24 on R5: Gi0/0/0 to R2 and Gi0/0/2 to R4. Both paths are supposed to be gigabit end to end. The team wants both used, so last week someone added variance 8 under router eigrp 100 on R1. Monitoring shows the R4 uplink still carries no traffic toward the data center. Classic EIGRP, default K values, every interface is gigabit.