Wonder what rule GIB found here

[thorvald]

[hv=url=https://www.bridgebase.com/tools/handviewer.html?lin=st||pn|Thorvald,~~v3fakebot,~~v3fakebot,~~v3fakebot|md|2SJ865HKJ5DA5CA864,SA32HA74D73CQJT52,SKHQ8632DJ842C973,SQT974HT9DKQT96CK|sv|b|rh||ah|Board%204|mb|P|mb|P|mb|P|mb|1C|an|Minor%20suit%20opening%20--%203+%20!C;%2011-21%20HCP;%2012-22%20total%20points|mb|P|mb|1H|an|One%20over%20one%20--%204+%20!H;%2011-%20HCP;%206-12%20total%20points|mb|1N!|an|Unusual%20notrump%20overcall%20--%203-%20!C;%205+%20!D;%203-%20!H;%205+%20!S;%2011-%20HCP;%2010-12%20total%20points|mb|D!|an|Support%20double%20-%203%20H%20--%203+%20!C;%203%20!H;%2011-21%20HCP;%2012-22%20total%20points|mb|2S|an|3+%20!S;%2011-%20HCP;%2012-%20total%20points|mb|3C|an|4+%20!C;%204+%20!H;%2011-%20HCP;%206-12%20total%20points|mb|P|mb|P|mb|D|an|3+%20!S;%2011%20HCP;%20biddable%20!C;%2012%20total%20points|mb|P|mb|P|mb|P|pc|D7|pc|D8|pc|DT|pc|DA|pc|S5|pc|SA|pc|SK|pc|S4|pc|D3|pc|D2|pc|D9|pc|D5|pc|DK|pc|C4|pc|C5|pc|D4|pc|H7|pc|H2|pc|HT|pc|HJ|pc|S6|pc|S3|pc|C3|pc|S7|pc|H3|pc|H9|pc|HK|pc|HA|pc|H4|pc|HQ|pc|CK|pc|H5|pc|DQ|pc|C6|pc|CT|pc|DJ|pc|S2|pc|C7|pc|ST|pc|S8|pc|H6|pc|S9|pc|CA|pc|C2|pc|SJ|pc|CQ|pc|H8|pc|SQ|pc|CJ|pc|C9|pc|D6|pc|C8|]399|300[/hv]

 

Trusting West GIB I should probably have bid 3♥, but that 3♣-bid was strange

[smerriman]

Long story short, while GIB knows that x was a support double when you made it, later in the sequence it's using rules that are only meant to apply after you made a penalty double, and its rules about what to do after a penalty double / forcing passes / etc are very messed up.