Heiken ashi Renko EA, need to fix error


I have heiken ashi Renko EA , when candle color change EA open the trade on the very next candle. But i faced some error, sometimes it took the trade but sometimes it didn't, so i am looking someone whom help me for this matter.

1: when renko heiken ashi candle color change then EA open the lot of trades like 5/10 but i need only one.i use this EA on renko chart with heiken ashi layer, on big renko pip setting like 5/10 per box it's working fine but lower like 1pip per box didn't work.

2:i have a one custom indicator with buy arrow and sell. Sometime when i select buy mode and buy arrow appear that time EA didn't open any trade.i need to fix this error when arrow appear, the next renko heiken ashi candle EA open the trade.

I attached my chart hope someone understand.