Composing "to" field autocomplete fail

When composing a message and entering an email address, when i start typing, i rely on autocomplete to help speed up my productivity. Currently, however, if I type “sven@vina” I get results that do not match such as “sven@siri…” and others. This is a pretty significant problem because it requires me to use my mouse instead of just using the keyboard to quickly compose and fire off emails. See screenshot - green arrow is the result i expected, and red arrows are all the incorrect results.

Try typing ‘vina’ first as the search process is just scanning the letters you are typing in order of their typed appearance.

I get a similar situation

but the second proposed @ has no inside, Name, nor @: where is it from?