everyone!

I am testing a strategy simply based on 25 moving average lines, and using some boolean variables to contrl open, SL or TP. But these bool variables seems not work.

And in my vision, it can not open another long or short position, before it exit or close current long or short position. But unfortunately, it also failed.

Who can tell why? Thanks!
Here is my code…

// This Pine Script™ code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/

//@version=5
strategy("25 average", overlay=true, margin_long=100, margin_short=100)

myma = ta.sma(close, 25)
plot(myma)

// ctrl to open position
var canLong = false
var canShort = true

// determine whether in a long or short position
var isLong = false
var isShort = false

// SL position
var longLoss = 0.0
var shortLoss = 0.0

// calc when to TP
longDelta = math.abs(high - ta.sma(close, 25))
longTP = longDelta < longDelta[1] ? true : false

shortDelta = math.abs(low - ta.sma(close, 25))
shortTP = shortDelta < shortDelta[1] ? true : false

// long open
if canLong and ta.crossover(close, ta.sma(close, 25))
    strategy.entry("BUY", strategy.long)
    isLong := true
    canLong := false
    canShort := false
    longLoss := low


// long SL
if isLong and close < longLoss
    strategy.close("BUY", "Long SL")
    isLong := false
    canShort := true

// long TP
if isLong and longTP
    strategy.close("BUY", "Long TP")
    isLong := false
    canShort := true

// short open
if canShort and ta.crossunder(close, ta.sma(close, 25))
    strategy.entry("SELL", strategy.short)
    isShort := true
    canShort := false
    canLong :=false
    shortLoss := high

// short SL
if isShort and close > shortLoss
    strategy.close("SELL", "Short SL")
    isShort := false
    canLong := true

// short TP
if isShort and shortTP
    strategy.close("SELL", "Short TP")
    isShort := false
    canLong := true

enter image description here
enter image description here

That is what i have done, please help me, thanks!