'NFS mount display confused occasionally

we use cmd "**mount -t nfs -o nfsvers=3,rw,bg,soft,nointr,rsize=262144,wsize=262144,tcp,actimeo=0,timeo=600,retrans=3,nolock,sync /ip1/**pathA /mnt", mount success. But we use mount to check, it`s display /ip1/**pathB **is mounted on /mnt However, **pathB **is a file system that was created a long time ago but no longer exists. we guess there is some cache in NFSServer? nfs client is CentOS Linux release 7.6.1810 (Core)

we want know the root cause



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