Number of incoming/outgoing docs are calculated wrongly during rebalance

Steps:

1. Initialise a 2 node KV cluster running 7.6.0-2182 server version.
2. Configure the cluster to have just 2 vbuckets.
3. Create a Magma bucket and load docs into it. Bucket only has 2 vbuckets.
4. Perform swap rebalance with a spare node.
   (172.23.110.65 - going out, 172.23.110.66 - coming in)
5. During rebalance, it was observed that incoming/outgoing docs were greater than the bucket item count (as seen in the image below). Since the bucket only has 2 vbuckets, 1 vbucket would move to the destination node.
   
6. After rebalance, it was observed that the node 172.23.110.66 has 6.1k documents
   
7. So, the number that is displayed in the rebalance box should be close to 6.1k but it is wrongly shown as 16255.
8. Cb-collect logs are attached.