LS Retail transactions that won't post

I have about 30 transactions appearing in Transactions Header, Trans Sales Entry and Trans Payment Entry that won’t post. There is a ZReport reference but posted status and statement reference for half of the days transactions (after 2:57pm) is missing. The Z report was run AM following morning which is common for us and Z-Report totals to the complete set of transactions - both posted and unposted. The post was done 3pm the following day but only half the transactions posted. I’ve tried to re-run the post with that days dates, and also tried with the dates along with start and end times to match what is unposted - but still nothing comes up. I’ve never seen a problem like this before.