Hi
I would suggest slightly different back amounts for each system, and to check for no unmatched. example:
system 1, bet amount = 10.00
trigger "system 1 win market bet" number of runs is equal to 1
and selections trigger expression winplace_back_matched is equal to 10
and selections trigger expression winplace_back_unmatched is equal to 0
system 2, bet amount = 11.00
trigger "system 2 win market bet" number of runs is equal to 1
and selections trigger expression winplace_back_matched is equal to 11
and selections trigger expression winplace_back_unmatched is equal to 0
otherwise you are getting into separate banks for each system which is ok in test mode (separate Profiles) but real funds needs two betfair accounts