I have version 130.
I thought I had noticed it several times where the number of strategies created was less than before, but I dismissed it as being mistaken. Then I started to keep track and at some point, usually with a large number in the databanks, it seems to decrement, rather than increment the number of passed strategies.
I have the max number of records set to 3,000 and today, every hour or so I wrote down the time and number of strategies as I was generating Daily strategies on GBPJPY. It's not uncommon for it to decrease by one or two - I'm guessing that is the cross-checks after a strategy passes the basic tests. But today I recorded 2402 strategies, then an hour later, there were 2347 in the data banks.
number of passed strategies doesn't need to equal number of strategies in databank because a part of strategies that were to be added to databank could have been filtered out by similarity.