Closing selling position not executed?!

[minou92]

I have this following strategy, which it has the holding period, the duration for which a position is held before being closed. The delay is the time delay applied after a trade signal is generated before executing a trade. When I run it, it cannot distinguish between long and short positions. meaning it manages to close buy position after holding period, but not sell position.

class WeatherStrategy(Strategy):
    holding_period = 30  # You can set a default value here
    delay = 10
    
    def init(self):
        self.entry_time = None
        self.signal_time = None  # To store the time of the signal

    def next(self):
        signal = self.data['trade_signal']
        current_time = self.data.index[-1]
        s = self.data.size[-1]

        if not self.position:
            if signal == 1 and self.signal_time is None:
                self.signal_time = current_time  # Record the time of the signal
                print(f"Buy signal at {current_time}")

            if self.signal_time is not None and (current_time - self.signal_time) >= pd.Timedelta(minutes=self.delay):
                self.signal_time = None  # Reset the signal time
                self.buy(size=s)
                self.entry_time = current_time
                print(f"Buy at {current_time}")

            if signal == -1 and self.signal_time is None:
                self.signal_time = current_time  # Record the time of the signal
                print(f"Sell signal at {current_time}")

            if self.signal_time is not None and (current_time - self.signal_time) >= pd.Timedelta(minutes=self.delay):
                self.signal_time = None  # Reset the signal time
                self.sell(size=s)  # Corrected: This should be sell for short position
                self.entry_time = current_time
                print(f"Sell at {current_time}")
        else:
            time_in_trade = current_time - self.entry_time
            if (self.position.is_long and time_in_trade >= pd.Timedelta(minutes=self.holding_period)):
                self.position.close()
                print(f"Close long position at {current_time}")

            if (self.position.is_short and time_in_trade >= pd.Timedelta(minutes=self.holding_period)):
                self.position.close()
                print(f"Close short position at {current_time}")

some results of the print:
Buy signal at 2022-11-23 10:27:00
Buy at 2022-11-23 10:37:00
Close long position at 2022-11-23 11:07:00
Sell signal at 2022-11-25 10:27:00
Buy at 2022-11-25 10:37:00
Close long position at 2022-11-25 11:07:00
Sell signal at 2022-12-02 10:27:00
Buy at 2022-12-02 10:37:00
Close long position at 2022-12-02 11:07:00
Sell signal at 2022-12-07 10:27:00
Buy at 2022-12-07 10:37:00
Close long position at 2022-12-07 11:07:00
Sell signal at 2022-12-09 10:27:00
Buy at 2022-12-09 10:37:00
Close long position at 2022-12-09 11:07:00
Sell signal at 2022-12-16 10:27:00
Buy at 2022-12-16 10:37:00
Close long position at 2022-12-16 11:07:00