Whats under the hood?

[MrDenfish]

Love this program! I'm very new (as my question will substantiate),please forgive me if the answer is glaringly obvious:

I was writing my own indicators in order to help me understand the program and came across something I perceived to be odd.
When I have a few indicators (self.I) I noticed that the first trade will not happen until the indicator with the largest length as been met, even if that indicator is not used as a condition to open or close a trade. In my case I have the following indicators and their lengths; sma/14, rsi/14,ema/50 and ema/200.
If I run with all indicators active (not commented out) the first trade will not happen until the 200th bar, with ema/200 deactive first trade happens at the 63rd bar, and if the ema 50 and ema200 indicators are both deactivated then the first trade happens correctly at the 29th bar. Why do the ema indicators affect when the first trade happens, even when they are not a condition of the trade?
Clear as mud I'm sure , so I hope some code and output snippets will help.

np_close = np.array(GOOG.Close)
self.sma_pine = self.I(pine_sma,np_close,14,name="Pine-SMA", overlay=True, color='Orange', plot=True)
self.rising = self.I(pine_rising,GOOG.Close,self.sma_pine,self.barsback)
self.pine_rsi = self.I(pine_rsi,GOOG,14,name="Pine-RSI",overlay=False,color="Blue",plot=True)
self.ema50 = self.I(pine_ema,GOOG.Close.to_numpy(),50,name="EMA-50", overlay=True, color='Blue', plot=True)
self.ema200 = self.I(pine_ema,GOOG.Close.to_numpy(),200,name="EMA-200", overlay=True, color='Purple', plot=True)

`
self.overbought = crossover(70,self.pine_rsi)

if self.position and self.overbought:
    self.position.close()
elif not self.position and self.rising:
    self.buy()
`

with ema 200 active this makes sense if the ema 200 is part of the trade condition, but it is not.

    Size  EntryBar  ExitBar  EntryPrice  ExitPrice         PnL  ReturnPct  EntryTime   ExitTime Duration
0    3.0       200      202  291.696444     279.56  -36.409332  -0.041606 2005-06-06 2005-06-08   2 days
1    3.0       203      204  287.054406     282.50  -13.663218  -0.015866 2005-06-09 2005-06-10   1 days
2    3.0       205      217  283.485150     292.72   27.704550   0.032576 2005-06-13 2005-06-29  16 days
3    3.0       218      233  294.914790     302.40   22.455630   0.025381 2005-06-30 2005-07-22  22 days

with ema 50 active and ema 200 inactive

     Size  EntryBar  ExitBar  EntryPrice  ExitPrice         PnL  ReturnPct  EntryTime   ExitTime Duration
0    5.0        63       93  172.948500     192.79   99.207500   0.114725 2004-11-17 2004-12-31  44 days
1    5.0        94      202  203.237046     279.56  381.614770   0.375537 2005-01-03 2005-06-08 156 days
2    5.0       203      204  287.054406     282.50  -22.772030  -0.015866 2005-06-09 2005-06-10   1 days
3    5.0       205      217  283.485150     292.72   46.174250   0.032576 2005-06-13 2005-06-29  16 days

with ema50 and ema 200 inactive and sma/14 and rsi/14 active

  Size  EntryBar  ExitBar  EntryPrice  ExitPrice          PnL  ReturnPct  EntryTime   ExitTime Duration
0    7.0        29       43  129.936960     140.49    73.871280   0.081217 2004-09-30 2004-10-20  20 days
1    7.0        44       54  149.768388     184.70   244.521284   0.233238 2004-10-21 2004-11-04  14 days
2    7.0        55       93  169.790310     192.79   160.997830   0.135459 2004-11-05 2004-12-31  56 days
3    7.0       165      202  185.481000     279.56   658.553000   0.507216 2005-04-15 2005-06-08  54 days

[kernc]

See #732, d7eaa45 (TBR).