exported LSTM model keep returniing same prediction and score for different data

Question

I was working with sentiment analysis using LSTM, everything okay when I run the code and predict but when I export the model and load the model again in different notebook, my models keep returning the same result and same sentiment score. It always predict a positive sentiment, even when I test an obvious negative sentiment my model still predict positive

here's my code!

this is my colab code when I train the models

this is my colab when I loaded the model and it keeps returning positive

heres my dataset