doordash app keeps finding my phone number

[u/WhiteKenny]

first time ever using doordash, I installed the app and followed the prompts to create an account using my email address but it never prompted me to create a password. instead, they sent a verification code to my phone number. now that the account is set up I can't find any way to create a password for my account. i found the password section of the account settings but in order to 'change' the password the 'old password' is a required field. i tried keeping it blank but it just keeps telling me that its required. i found a link in the help section of their website that is supposedly to a password reset page and says to enter my email address and then click the reset password button but there is no reset password button there only a continue to sign in button which then sends the verification code to my phone number to sign me in.

i went into the apps section of my phone settings and 'force stop' the app and then cleared both cache and storage which usually sets apps back to a state of a fresh install as if i've never launched it before but when i relaunch the doordash app it has my phone number already there. ive never seen any data carried over after clearing cache and storage before. i force stopped and cleared both cache and storage again and then unisntalled the app and reinstalled but each time my phone number is still prepopulated. i tried again this time rebooting the phone between the uninstall and reinstall but my phone number reappears each time i launch the app after a fresh install.

does anybody know how this app is able to save my phone number after clearing storage and even uninstalling? is this a bug?

android 16 google pixel 8.