Why EMA value is different between ctrader mobile, cTrader Desktop, MT4

Hey I use EMA89_close for the symbol XAUUSD and notice the different result on 3 platforms:

XAUUSD 2021/03/06 01:00

- MT4: I got the value 1758.673

- ctrader Mobile (Pepperstone broker): I got 1758.99

- cTrader Desktop (Pepperstone broker) using built in EMA: I got 1767.01  (Mis-use SMA instead of EMA)

- cTrader Desktop (Pepperstone broker) using built in EMA: I got 1759.24

- cTrader Desktop (Pepperstone broker) using my custom indicator: I got 1759.24

Indicators.ExponentialMovingAverage(barsH4.ClosePrices, 89);

So the Indicator on the desktop is not correct? ==> Sorry I accidental use SMA instead of EMA on Desktop.