Profile Info UI flaws

There are the following two flaws in the Profile Info UI:

• Some fields are garbled sometimes, not every time:

• If I use the mouse wheel on a dropped-down list both the list and the browser's (FF 52.0.2) page scroll.

And there are two more when editing a posting here:

• If I enter a list item of an ordered or unordered list that does not contain any text (as it is after the creation of a new item) the text cursor doesn't appear after the number or the bullet.
• If there are empty list items between two with content the text cursor can't be placed on these empty items with the up/down keys. It can be placed with the mouse but, see above, one can't see it.

Examples:

• Text cursor jumps here on [ ↑ ]
•  
•  
• Text cursor jumps here on [ ↓ ]

Text cursor jumps here on [ ↑ ]

1.  
2.  
3. Text cursor jumps here on [ ↓ ]

UPDATE

I just realized that there are two edit modes. One with black serif Times New Roman and one with the dark grey sans-serif Arial. The behaviour here appears on the latter only. (I'm still pondering whether I should consider this unsolicited switching of modes the third flaw here. ;)