[m1cha]

The label for the 3♠ bid reads "4- ♦; 6+ ♠; 11-12 total points". I decided that 4♠ has better chances than 5♦ and end up playing in a 4-2 fit with the 6-card ♠ suit to my right.
I didn't find that funny. 3NT is as cold as ice. How about N bid 3♥ (even if it's a slight overbid)?

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[smerriman]

GIB showing 6+ spades after a takeout double when it only has 4 is something I've seen before too. jdonn replied that he thought it's being worked on (whatever that means).

[lycier]

No double,no trouble. This have been a weak area for Gib in many years.

[m1cha]

It probably means that it's being worked on but it's being complicated. And while you are still trying to figure it out, some other matters come in. So you put it aside for a little while and for another little while ... Life in the real world.

I noticed something both our hands have in common. In your hand there's the 2♥ bid by S labeled "3+ ♥" but it should actually be 4 hearts unless we have an emergency. In my case the 3♦ bid by S is labeled "4+♦" but it should actually 5+ diamonds unless we have an emergency because in ~ 95 % of all hands with just 4 diamonds S should have another, better bid. In consequence, N may not be satisfied with the fit and, trying to find something better, goes wild. Maybe that helps. If it's correct.

Edit: Another possibility: It might be a mismatch in bidding routines. Because in a similar sequence such as
1♦ (2♣) X (p);
3♥ (p) 3♠
the bid just shows a 4-card suit.