Why won't the portal keys drop when destroying links?

I have seen this multiple times where I have destroyed a portal and its links yet keys do not drop at either the portal I destroyed nor the other portal it was linked to. What is funny is that it seems to only happen to the portals/links of these one or two specific players. Anyone know why this might happen?

Solution 1:

A few things to note:

1. Key drops on link destruction is based on a chance, it is not a guaranteed drop (Much like the chance when hacking a Portal).
2. If a key drops, it could drop at either one of the Portals, also based on a chance.
3. The Owner of the Portal, the amount or levels of its Resonators and the Mods on said Portal does not have an influence on any of these two chances.

Solution 2:

Key drop on link destruction isn't guaranteed. It's entirely possible to destroy a big number of links without receiving any related key, the same way a key drop isn't guaranteed when hacking a portal.

It has absolutely no relationship with the owner of the portal, it's just a matter of chance.