Hi, @rdubiel
The issue you are reporting can be caused by either a conflicting autofill app or native password manager within the browser, or possibly a problem with your LastPass cache.
I clear my browsing cache daily; I do not have any autofill apps other than LastPass; the problem happens while using Chrome, Bing and Safari, -it is not the browser, it is Lastpass. Still waiting for a clear solution from a knowledgeable person