Wrong size while creating a Volume (PVC / PV)

When I try to add a persistent volume and I specify 0.1 GB for the size I get wrong size as result:

0.1GB on Rancher interface. (I want 100MB)

and this below showing on kubectl:

NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pvc-26a32085-4bde-437f-81ec-cf6b54964372 107374182400m RWO Delete Bound default/teste standard 6m49s

This caused a major issue with OpenEBS storage class, bringing down rancher and almost all kubernetes cluster with high CPU and Memory usage.

Why this happened and how to fix?