Paul, let's have a look at your iPad's configuration. Go to
Settings, Safari and check the autofill and cookie settings. Allowing cookies from the current website only will be sufficient.
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Saved Passwords will reveal a list with all URLs and their connected accounts. Look for the community URL. Your account name should be shown next to it. In case you've unintentionally choosen not to save the password,
not saved will be shown instead. Then you have to delete that entry before the password can be saved again next time you log in.
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