Reindex issue in magento 2.1.6

[BSK1]

Hi,

I am running a full re index from CLI (bin/magento indexer:reindex) and shows status "rebuilt successfully " for all items.
But time stamp not changing for one the item 'catalog_product_category' and that jobs executes "00:00:00" (Shows old time stamp)
Below is the o/p from CLI re index.

Design Config Grid index has been rebuilt successfully in 00:00:00
Customer Grid index has been rebuilt successfully in 00:00:00
Category Products index has been rebuilt successfully in 00:38:42
Product Categories index has been rebuilt successfully in 00:00:00
Product Price index has been rebuilt successfully in 00:00:43
Product EAV index has been rebuilt successfully in 00:01:19
Stock index has been rebuilt successfully in 00:00:00
Catalog Rule Product index has been rebuilt successfully in 00:00:00
Catalog Product Rule index has been rebuilt successfully in 00:00:00
Catalog Search index has been rebuilt successfully in 00:14:25

[Elsner_Tech]

All the indexing take the different time to reindex properly , If any of the index takes the less than 1 second to index it . than its timestamp shows to 00.00.00 

After Reindexing using CLI you can check it on Admin panel as it showing INDEXED or not . If it is showing the Indexed than it is properly indexed.