At the time of the question, Bitcoin Cash mempool had 917 transactions, and the Bitcoin mempool only had 8.1k.
yes from ABC
getinfo says "version": 140400
You're running an outdated version of Bitcoin ABC.
140400 translates to Bitcoin ABC 0.14.4, but the current release is Bitcoin ABC 0.14.6. Mandatory two-way replay protection was introduced either with 0.14.5 or 0.14.6. Your older version still considers Bitcoin transactions to be valid, so you're collecting both Bitcoin and Bitcoin Cash transactions in your mempool. Obviously, Bitcoin transactions aren't leaving your mempool though, because they are not being included in blocks. Thus, eventually your node's mempool will consist solely of Bitcoin transactions, assuming that Bitcoin transactions generally have a higher fee level.
Updating to the current version of Bitcoin ABC should resolve the discrepancy.