Tomstones impact on repairs both anti-entropy and read repair

[K F]

Hi Folks,
I have a table that has lot of tombstones generated and has caused inconsistent 
data across various datacenters. we run anti-entropy repairs and also have 
read_repair_chance tuned-up during our non busy hours. But yet when we try to 
compare data residing in various replicas across DCs, we see inconsistency.
My question to the community is will tombstone cause issues in data consistency 
across the DCs.
Thanks.