Hi,
It seems that the ca certificate was renewed at 1-5-2018 .
And before renewed the root CA certificated , the CA certificate validity period was changed from 3 years to 5 years.
Please make sure that by confirm the information :
[certsrv_server]
RenewalValidityPeriodUnits = 5
RenewalValidityPeriod = years in the CAPolicy.inf file in system root folder (by default C:\Windows).
If so , no need to renew the CA certificate.
Best Regards,