Amending system Lots purchase order

I need to amend the logic of purchases, as system works slightly different then it should - it should perform BUY/SELL orders in a predefined sequence, but sometimes it is missed. 

System should work (described in 5 steps) STEP1:  system buys 0.1 Lots with TP at 1.5 and makes SL at 0.7. As price is moving and no TP and SL are breached before STEP2 action – Sell 0.2 Lots with TP 0.7 and SL 1.5. This will still go on until STEP5 reached it’s target of TP, then all trades (Steps 1-5) would close AT THE VERY SAME LEVEL, so STEP 1/3/5 would reach TP, and STEP 2/4 would reach SL levels – the trades overall are hedged. It is all illustrated in table below. (picture)

Unfortunately, system sometimes performs orders in random sequence like: STEP1 - STEP2 - STEP2- STEP3 and etc. (it doubles one order).

CAN YOU FIX IT (pls see attached file)?