Did you forget I'm a hard Brexit madman? asks Corbyn

[muriel_volestrangler]

5. Here's the story that T_i_B explained

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Jeremy Corbyn has sacked three Labour frontbenchers who voted against the party in favour of a Queen’s speech amendment calling for Britain to remain within the customs union and single market.

Queen's speech passes as 50 Labour MPs defy Corbyn and back staying in single market - Politics live
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The Labour leader, who has been emboldened by the general election result, decided to take a tougher approach than after the vote to trigger article 50, when shadow ministers who rebelled were allowed to remain in position.

Shadow housing ministers Andy Slaughter and Ruth Cadbury and shadow Foreign Office minister Catherine West joined dozens of Labour backbenchers, the SNP, Liberal Democrats, Greens and Plaid Cymru in backing the amendment.
...
Corbyn ordered his MPs to abstain on the wording because, although Labour policy chimes with most of the sentiment, the party does not support the bid to keep full membership of the single market.

https://www.theguardian.com/politics/2017/jun/29/jeremy-corbyn-sacks-three-frontbenchers-after-single-market-vote
So they voted to amend the Tory policy; Corbyn wanted all his party to abstain.