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VS indicator symbol A320 Neo

Posted: Mon Dec 19, 2016 4:59 am
by ayush.prd
While descending in the A320 neo I have found three symbols of vs in the PFD.

In the first version the VS is simply indicated without being enclosed in any rectangle.
https://postimg.org/image/ga7h90orb/

In the second one its enclosed in a white rectangle.

https://postimg.org/image/xpyobclzb/

In the third version it is enclosed in a yellow rectangle and also the aircraft does not descend in this case.

https://postimg.org/image/cszjmtwrh/

What do these mean?