I am very sorry that you had so many problems trying to use the plugin, thank you for making the time to let me know and explain the problems you had.
I will review the method Tweets are updated. It seems odd that only saving settings updated them, as it calls the same function to update everything. Nevertheless I will review the code and make sure there are no scenarios where it does not work as intended.
Thank you again for your feedback and I will endeavour to ensure that future users have a better experience using the feedback you have given.